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The 8 Best knife blades of 2025

Are you trying to find knife blades among various brands on the market but aren’t sure where to begin? To assist you in finding the right one, we’ve put together a list of the 7 best to help you pick the perfect one!

We investigated and evaluated a number of the top-selling knife blades on the market in order to create our list of the best. Making a decision among the many options available is never simple. There are an infinite number of models available, each with a distinct price. And as you’ll find out, the best options aren’t usually the ones you imagine! This comparison is rich and relevant because of the numerous factors that were employed. You will find products featured in this ranking not only based on their pricing but also on their features and other customers reviews. To write this review, we completed 16 hours of research and did 27 knife blades tests. You won’t need to pick products at random any more. If you’re unsure of what to look for, browse our list and consult the buying guide!

An overview of our top picks

Table of contents

The best knife blades you can buy today

SaleNo. 1
CRAFTSMAN Utility Knife Blades, 100 Pack, For Drywall, Leather, Rubber and More (CMHT11921A)
  • Heavy duty utility blade for general cutting, trimming, and scraping of a variety of materials
  • Precision-honed edge for consistent and long cutting life
  • Fits most standard utility knives
  • 100 pack
SaleNo. 2
WORKPRO Utility Knife Blades, SK5 Steel, 100-Pack with Dispenser
  • Notice: Be sure to watch our HOW-TO video before using it. It can help you slide the utility blade out quickly and easily
  • Super Versatility: It is made entirely according to standard utility knife blades and fits most standard & fixed utility knives perfectly
  • Affordable: Includes 100-pack replacement blades and they come in a well-built case for safe storage and disposal. Each blade is rigorously tested and we firmly believe this is a great deal
  • Durability: WORKPRO utility knife blades are made from SK5 steel, which is of high quality and durability
  • Sharp: The knife blades are highly sharp and cut through lots of materials easily and without hesitation. Ideal for cutting cardboard, leather, linoleum, rope, soft metal, etc
No. 3
M MEEPO 50-Pack Utility Knife Blades, Blackened SK-2 Razor Blades for Box Cutter Utility Knife, Never Rust Design, Extra Durable
  • Made from high strength blackened SK2 steel for superior durability and long-lasting sharpness. 5X sharper and durable than normal silver blades. Rust-resistant design for longevity and reliability
  • Each 10-piece blades storaged in hard transparent plastic case
  • Totally 50-pack utiity knife blades provide a long-lasting supply for all your cutting needs
  • Standard utility knife blades perfect fit for a variety of box cutters, utility knives
  • Perfect for sharing with coworkers, friends, or family members. And with 50 blades per box, you'll have plenty of blades to last you for multiple projects, no matter what your needs. Upgrade your cutting tool game today with M MEEPO Utility Knife Blades
No. 4
DIYSELF 50 Pack Utility Knife Blades, SK5 Steel Box Cutter Blades with Dispenser, Standard Blades for Box Cutter Utility Knife Replacement, Sharper Utility Blades, Refills
  • Standard Size: The size of the blade is a universal size. And the blade can be used as a replacement blades for box cutter and utility knife. Thickness: 0.0236 inch / 0.6 mm
  • Sharp Cutting: The edge of the utility knife blades are precisely polished, so the box cutter blades cut quickly and smoothly. It is also suitable for cardboard, rubber, carpet, leather, wallpaper, plastic, PVC and other materials
  • High Quality Material: The utility blades are made of SK5 alloy steel, which has higher hardness, better wear resistance and longer service life than ordinary blades
  • Portable Packaging: 50 SK5 box cutter blades refills are packed in a well constructed box, which is not only convenient to take, but also convenient to use carry and store for you
  • Multipurpose Use: Sharp utility razor blades can help you effectively improve your work productivity. Therefore, the blade is not only suitable for home and office use, but also suitable for warehouses and construction sites use
SaleNo. 5
OUTDOOR EDGE 3.5' RazorSafe Replacement Knife Blades, 6 Pieces
5,040 Consomer Reviews
OUTDOOR EDGE 3.5" RazorSafe Replacement Knife Blades, 6 Pieces
  • JAPANESE 420J2 STAINLESS STEEL – Blades are precisely heat-treated and hand finished shaving-sharp to ensure excellent edge retention and performance.
  • INDIVIDUALLY VACUUM SEALED – Each blade comes sealed in a plastic pouch with PVC blade cover to protect the blade from the elements and to improve safety when transporting and changing blades.
  • RAZOR SHARP AND TOUGH AS NAILS – Versatile drop point design is a true work horse for the most demanding chores and equally suited for fine, detailed cuts.
  • REPLACEMENT BLADES ONLY – Both 6 and 24 piece blade packs are compatible with the 3.5-inch RazorLite EDC, RazorLite, RazorPro, 3.5-inch Onyx EDC, RazorBone, RazorMax and RazorFin.
No. 6
CRAFTSMAN Utility Knife Blades, Carbon Steel, 3/4 Inch, 10 Pack (CMHT11700X​)
587 Consomer Reviews
CRAFTSMAN Utility Knife Blades, Carbon Steel, 3/4 Inch, 10 Pack (CMHT11700X​)
  • BLADE SHARPNESS: Induction hardened blade for long lasting sharpness
  • DURABILITY: Blade stays 3 times sharper longer than traditional carbon steel blades
  • Fits most standard utility knives
  • 10 Pack
SaleNo. 7
ZUZUAN Utility Knife Blades SK5 Steel 200-pack with Plastic Case, Durable Single Edge Box Cutter Blades, Standard Size Knife Blades for Most Standard Utility Knives, Silver
  • Made from Heavy Duty Premium SK5 steel, which is industrial high carbon steel, compare with general carbon steel, SK5 steel has higher hardness and wear-resistance for maximum durability
  • Each utility knife blade was engineered with a precision-honed edge which has flat, neat and sharp edge, so the utility knife blade features faster cutting speed and extended cutting life without breakage
  • Single edge knife blades are standard size for most standard utility knives, trapezoid shape, 2.4” length, 1.25” width, 0.75” height, 0.6mm thickness, 10pcs knife blades are individually wrapped by a plastic case, total 20 plastic cases including 200pcs knife blades
  • Industrial design-The cutter blade’s cutting angle is 50 degree, making the force more uniform and not easy to break, ideal for cutting cardboard, rubber, leather, linoleum, rope, soft metal and most DIY projects, designed for general purpose cutting
  • Our cost-effective knife blades are packed in plastic cases for safe storage and convenient use, and each knife blade is rigorously tested, meanwhile the unit price is no more than 0.07 dollar, the most economic ones on Amazon
  • The blades are coated with a light coat of OIL to PREVENT RUST and stay sharp, making them stick together a little bit, need to be careful or wear gloves, but no worries, this oil let's separate them easily as well
No. 8
Bates- Utility Knife Blades, 40 Pack, Box Cutter Blades, Razor Blades Utility Knife, Razor Knife Blades, Replacement Blades, Razor Blades for Box Cutters, Box Razor Blades, Box Cutter Blades Refills
2,451 Consomer Reviews
Bates- Utility Knife Blades, 40 Pack, Box Cutter Blades, Razor Blades Utility Knife, Razor Knife Blades, Replacement Blades, Razor Blades for Box Cutters, Box Razor Blades, Box Cutter Blades Refills
  • Bates package includes 40 durable Utility Knife Blades
  • The blades fit most standard utility knives
  • Multipurpose Utility Knife Blades Are Perfect For cutting drywall, insulation, flooring, roofing, and more
  • Made from Heavy Duty Premium steel, 2x sharper and harder compare with other brands
  • Precision-honed edge is ideal for stable and extended cutting life
No. 9
HORSUDY 100-Pack Utility Knife Blades, Box Cutter Blades Replacement with Dispenser, SK5 Carbon Steel
  • Constructed of SK5 carbon steel, these high quality utility blades are designed with precision-honed edges, providing superior sharpness and durability compared to ordinary blades.
  • Versatile utility: The universal utility knife replacement blades are standard size to fit and deliver optimum performance in most utility knives and box cutters.
  • Thickness: 0.0236 inch / 0.6 mm, providing a strong and durable blade that can handle tough cutting tasks.
  • Innovative designs: With 3 holes, the compact blade dispenser can mount on the wall for easy access. The scale on the side of the dispenser indicates the remaining utility blades quantity. The separate compartment is designed to offer convenient and safe storage for used utility blades.
  • Wide application: All-purpose utility knife replacement blades are great for cutting a variety of materials, like cardboard, leather, carpet, drywall, sheetrock, linoleum, rope, soft metal, pipe, and paper, and suitable for most DIY projects.
SaleNo. 10
Knife Blades Bulk Pack 50 Piece
  • Knife Blades Bulk Pack 50 Piece
No. 11
JETMORE 100 Pack Utility Knife Blades, Box Cutter Blades with Dispenser, SK5 High Carbon Steel Heavy Duty Utility Knife Replacement Blades, Standard Size Sharp Blades for Most Box Cutter
  • 【High Quality SK5 High Carbon Steel】This utility knife blade is made of high quality SK5 high carbon steel. The blade made of this material is not easy to rust. It is specially designed for heavy utility knife. The solid steel makes the blade have a longer service life.
  • 【Sharp & Durable】The edge of the box cutter blade has been precisely honed. The blade is extremely sharp, which can easily complete your cutting work and maximize efficiency. The blade is not easy to bend or break. Please be careful when using it to avoid cutting fingers.
  • 【Handheld Dispenser】These knife blades are packed in a box carefully designed by us, which is safe and convenient for storage. The blade box is 13.1CM/5.2 Inch long and 7CM/2.8 Inch wide, with three holes on the top. You can hang it anywhere. You can safely take out one blade each time. The number of remaining blades can be seen on the transparent side.
  • 【Widely Used】Standard size utility knife blade, 3.2CM/1.26 Inch in upper width, 6CM/2.37 Inch in lower width, 18.6CM/0.73 Inch in height, is perfect for both retractable box cutter and folding utility knife. You can cut cardboard, leather, rope, rubber or PVC after installation.
  • 【After Sales】If you encounter any problems in using the blade, please contact us immediately. We are happy to help you solve any problems you encounter in a timely manner. Each blade has been strictly tested. JETMORE aims to provide people with more professional and high-quality knife tools.
SaleNo. 12
HEIKIO 18mm Snap-off Blades, 50-Pack, Quality Black Carbon Steel Made, Sharp and Durable, Heavy-duty Replacement Blade for 18mm Box Cutter and Utility Knife
  • 50 pcs heavy-duty knife blades in one package. Blade dimensions: 4 x 0.7 x 0.02 inches.
  • 0.7 inches (18mm) wide blades, which are compatible with most 18mm retractable knives.
  • 60 degree cutting angle and 8 snap off segments per blade.
  • Made of high quality carbon steel, this blades last longer and are sharper than normal silver blades.
  • Suitable for different cutting events, for instance, the cutting of box, cardboard, rubber, leather, carpet and PVC material etc..
No. 13
DIYSELF 150 PCS Exacto Knife Blades 11, Sharp Hobby Knife Blades, High Carbon Steel Craft Knife Blades, 11 Hobby Knife Replacement Blades, Exacto Blades for Art, Scrapbooking, Stencil, Paper Cutting
  • Rust Resistant & Lubricated :Finely coated with a thin layer of lubricant to protect the blades from rust and ensure quality after prolonged storage.
  • Fit In All Fine Craft knives :Our blades are standard #11 fine point blades and fit all craft knives.
  • Wide Application :Ideal for cutting wood, cardboard, paper, plastic, cloth, leather and foam board craft.
  • Great Blades So Far :Razor-sharp premium blades are made from solid SK-5 high carbon steel for a sharp edge that lasts.
  • 100% Risk Free Purchase :If you are not satisfied with DIYSELF hobby knife blades set.Please contact us, we will provide your 100% service
No. 14
WORKPRO Utility Knife Blades, 100-Pack Utility Blades Replacement with Dispenser, SK5 Carbon Steel, Red
  • Premium SK5 Steel: Constructed of SK5 carbon steel, designed with precision-honed edges, these high quality utility blades stay sharp longer compared to ordinary blades.
  • Versatile Utility: The universal utility knife replacement blades are standard size to fit and deliver optimum performance in most utility knives and box cutters. Thickness: 0.0236 inch / 0.6 mm
  • 2 Handy Dispensers: Push the black button to take 1 utility blade, and pull the bottom to take 5 utility blades. Safely take 1 or 5 utility blades at one time from different positions, meeting your various needs. Dispensers made of durable plastic, 100 refill razor blades included for long-lasting use.
  • Innovative Designs: With 3 holes, the compact blade dispenser can mount on the wall for easy access. The scale on the side of the dispenser indicates the remaining utility blades quantity. The separate compartment is designed to offer convenient and safe storage for used utility blades.
  • Wide Application: WORKPRO all-purpose utility knife replacement blades are great for cutting a variety of materials, like cardboard, leather, carpet, drywall, sheetrock, linoleum, rope, soft metal, pipe, and paper, and suitable for most DIY Projects.
No. 15
Berkling Utility Knife Blades Titanium Plated 50-Pack With Dispenser, SK2H Laser Sharpened Hardened, Ultra 3X Sharper and 15X More Durable, Standard T-Shape Replacement Box Cutter Razor Blades
  • ▶︎ 𝗟𝗔𝗦𝗘𝗥 𝗦𝗛𝗔𝗥𝗣𝗘𝗡𝗘𝗗 & 𝗧𝗜𝗧𝗔𝗡𝗜𝗨𝗠 𝗣𝗟𝗔𝗧𝗘𝗗 - Looking for precision and endurance? Discover the difference with our laser-sharpened SK2H utility knife replacement blades with full titanium plating. Expect 3x the sharpness and 5x the durability compared to standard blades and even SK5, making them perfect for razor blade refills for utility knives.
  • ▶︎ 𝗥𝗨𝗦𝗧-𝗥𝗘𝗦𝗜𝗦𝗧𝗔𝗡𝗧 𝗘𝗫𝗖𝗘𝗟𝗟𝗘𝗡𝗖𝗘 - Worried about blade degradation? Our Titanium-Plated SK2H utility knife blade offers superior protection against corrosion, making it ideal for replacement razor blades for utility knives. These sharp blades boost efficiency and are suitable for homes, offices, warehouses, and construction sites.
  • ▶︎ 𝗨𝗡𝗜𝗩𝗘𝗥𝗦𝗔𝗟 𝗥𝗘𝗣𝗟𝗔𝗖𝗘𝗠𝗘𝗡𝗧 𝗙𝗜𝗧 - Size matters, and ours is at 61 x 18.8 mm. Perfectly compatible and can be used as a replacement with most box cutter razor blades, utility knives, pocket knives, and even as box cutter blade refills.
  • ▶︎ 𝗦𝗧𝗔𝗡𝗗𝗔𝗥𝗗 𝗦𝗜𝗭𝗘 𝗪𝗜𝗧𝗛 𝗠𝗨𝗟𝗧𝗜𝗙𝗨𝗡𝗖𝗧𝗜𝗢𝗡𝗔𝗟 𝗗𝗘𝗦𝗜𝗚𝗡 - Our T-shape utility knife razor blades, featuring 2 notches and dual-side cutting, boast a 0.6mm thickness, striking the right balance between strength and flexibility.
  • ▶︎ 𝗣𝗔𝗖𝗞𝗔𝗚𝗜𝗡𝗚 - Enjoy prolonged efficiency with our bulk pack of 50 utility knife blades. Paired with an easy-to-use dispenser, switch to a fresh blade effortlessly whenever you need it. Efficiency and convenience are packed into one.
  • ▶︎ 𝗦𝗔𝗙𝗘𝗧𝗬 𝗙𝗜𝗥𝗦𝗧 - Respect the edge. Our blades are razor-sharp. Use cautiously, keep away from children, and always prioritize safety.
SaleNo. 16
STANLEY Utility Knife Blades, Classic 1992, Heavy Duty, 100-Pack (11-921A)
  • Engineered for all-purpose cutting
  • Dispenses 1 blade at a time
  • Precision-honed blade edge for consistent, long-lasting cutting life.
  • Blades fit most standard utility knives
  • Dispenser and 100 Blades included
SaleNo. 17
Goldblatt 100-Pack Utility Blades Premium Tempered SK2M Steel with Dispenser (G08283)
2,969 Consomer Reviews
Goldblatt 100-Pack Utility Blades Premium Tempered SK2M Steel with Dispenser (G08283)
  • SK2M Blade Features - High end alloy steel plus precision double honed edges make this blade up to 3X long lasting and durability than other traditional carbon steel blade
  • Two Dispensers - Allow your safely take 1 blade or 5 blades out at one time from different positions, meet your different needs. Compact and convenient blade dispenser protects and organizes blades
  • Innovative Designs - Remaining blade indicator for clear indication of blades quantity & Separate storage locations for recycling used blades or disposal blades for environmental protection
  • Universality - 100 pack razor sharp serrated blades are standard size for most standard utility knives. Thickness: 0.0236 inch / 0.6 mm
  • Application - Ideal for cutting cardboard, leather, linoleum, rope, soft metal, pipe, paper, suitable for most DIY Projects
No. 18
WORKPRO 18mm Snap-off Blades, SK5 Steel Replacement Blade Fits all 18mm Utility Knife & Box Cutter, Pack of 100
785 Consomer Reviews
WORKPRO 18mm Snap-off Blades, SK5 Steel Replacement Blade Fits all 18mm Utility Knife & Box Cutter, Pack of 100
  • 100PCS Replacement Blade: The package comes with 100 pcs 18mm replacement razor sharp blades. No need always rush to the store to buy the replacement anymore, just pick the fresh one you want.
  • Strong Rust Resistant & Super Sharp Edge: A razor-sharp acute cutting angle blade that integrates well-built and durable SK5 steel, black coating and multi-step sharpening to produce exceptionally smooth and fine cutting performance.
  • Lastest Storage Ideas: Each of the 10 plastic cases in the subpackage contains 10 blades and is light and small enough to carry when you are doing the outside work. You won’t blame yourself for forgetting to take the blades. The hang hole of the blade box makes it can be hung on your workbench, which is space-saving.
  • Wide Application: WORKPRO replacement blades make your life more convenient. Multi-functional replacement blades are ideal for craft hobbyists and artists to use at work, home or school like cutting fabric, shrink-wrap, leather, wallpaper, vinyl, altering, sewing, tailoring and raw materials.
  • Convenient to Use: Designed with a 4-inch (100mm) length and 8 cutting edges per blade, these 18mm snap-off blades are easy to use and suitable for long-term use. Snap the old section off with a knife cap, wearing gloves for security.
No. 19
Jetmore 60 Pack Exacto Knife Blades 11, Craft Knife Blades Replacement, Exacto Blades 11, Hobby Knife Blades Refills for Art, Craft, Scrapbooking, Cutting, Carving
  • 【60 PACK HOBBY BLADES】Reliable and sharp spare blades, stored in a transparent box and each blade is coated with a thin layer of oil to prevent rusting, you can create with confidence and don't have to worry about the blades running out quickly.
  • 【HIGH QUALITY】SK5 alloy steel hobby knife replacement blades, extra-thick, premium steel blades. No-rust, exquisite workmanship, processed by multiple processes, sturdy and durable, not easy to chip.
  • 【SMOOTH CUTTING】25-degree blade angle, straight-pointed blade carving is smoother and more detailed, more in line with the cutting of paper models and small parts.These hobby knife blade refills fit in all fine #11 craft knives. Replaceable blades, long service life of the craft knife.
  • 【WIDE APPLICATION】Exacto blades ideal for cutting thin wood, scrapbooking, cardboard, paper, plastic, cloth, leather and foam board craft to meet your different needs.
  • 【GREAT SUPPORT】Our hobby knife blades are standard # 11 precision blades, suitable for all types of exacto knife. If you have any questions about our exacto knife blades, please contact us, and we will reply to you as soon as possible within 24 hours. Thank you for your support!
No. 20
60 Pack Utility Knife Blades, SK5 Steel Heavy Duty Box Cutter Replacement Blades with Plastic Case, Standard Size Razor Blades for Most Standard Utility Knives
  • Package includes: the package comes with 6 boxes of fixed knife blades, and each box contains 10 pieces blades,meet your needs for use and replacement.Fit most standard & fixed utility knife perfectly
  • Made from heavy duty premium SK5 steel, which is industrial high carbon steel , SK5 steel has higher hardness 60-63HRC and wear-resistance for maximum durability.5 times longer service lifetime than other general carbon steel
  • Each utility knife blade was engineered with a precision-honed edge and 26°cutting angle which make the blade sharp enough to cut.There is a layer of anti rust oil on the blades to prevent dust and rust.
  • These blades are extremely sharp and cut through lots of materials super easy without any hesitation.Ideal for cutting cardboard, rubber, leather, linoleum, rope, soft metal and most DIY projects, designed for general purpose cutting.
  • Your satisfaction is our greatest honor and responsibility! If you have any problems or questions, please feel free to contact us. we will offer you a best solution as soon as possible for sure!

How to choose a good knife blades

Does the idea of finding a fantastic knife blades make you anxious? When it comes to purchasing this product, specifically when deciding which model to select, has your head been spinning between options? You are not alone if that is the case. We are aware of the pressure involved in the purchasing process!

Your presence here indicates that you are interested in knife blades. Before choosing which product would be the best for your needs after being inundated with information, locate a reliable source with genuine selections. You can get that information from a variety of sources, including buying guides and rating websites, word-of-mouth recommendations from friends and family, online discussion forums where users can share their own experiences, product reviews that can be found all over the internet, and YouTube channels. You can only get the right product through exhaustive analysis. But you realize that’s not always simple. In order to ease your concerns, we have taken the time to develop a list of the top knife blades products available right now. You might be wondering how we came up with the list. How was this buying guide developed?

First, we used our algorithms to gather as much reliable data as we could about these products. To verify all the data gathered, we used both artificial intelligence and a lot of algorithms.
Then, our experts used criteria that are recognized in the business to evaluate them according to their quality to price ratio, allowing us to choose the top knife blades on the market right now!

The selection of the goods is not arbitrary. Before creating a list, we take into account a number of factors. Below are some of the criteria discussed:

Brand Value: What happens if you choose a dubious brand just because it appears to be a good deal? So the likelihood of receiving a product with a short shelf life increases. That is due to the fact that well-known brands have a reputation to uphold, while others do not. Top knife blades brands strive to provide some distinctive traits that set them apart from the competition. So, hopefully one or more of the items on our list will be perfect for you.

Features: Useful features are all you need, not tons of them. We consider the important aspects and select the top knife blades based on those.

Specifications: Numbers always help you measure the quality of a product in a quantitative way. We try to find products with higher specifications, but with the right balance.

Quality: A product’s quality may always be quantified with the aid of numbers. We look for goods with better standards that strike the proper balance. The best quality product that gets highly appreciated and recommended by experienced users.

Customer ratings:  Would it be accurate to suggest that the knife blades were used by hundreds of customers before you? Superior ratings indicate that many customers had better service.

Customer Reviews: Like ratings,  provide you with accurate and reliable information about the product from genuine customers. Customer ratings are very important to all of us because they contain accurate and reliable information about the customer service we received from several hundred customers.

Seller Rank: This is very intriguing! Not only do you need a good knife blades, you also need a product with rising sales that is trendy. It accomplishes two goals. First, the expanding user base proves the quality of the product. Second, given that number, producers must be able to offer greater quality and after-sales support.

Value: You get what you pay for, they say, so consider the value. Cheap isn’t always good and expensive isn’t always bad. However, that does not imply that spending a lot of money on a product that is flashy but underwhelming is a good idea. Before adding them to the list, we make an effort to evaluate how much value you can get for your money from your knife blades.

Durability: Durability and reliability are closely related concepts. You will benefit from a strong and long-lasting knife blades for months and years to come.

Product availability: Products come and go, and new ones replace the old ones. Most likely, a few new features and required changes were made. What use is it to use a supposedly good product if the maker no longer supports it? We make an effort to highlight products that are current and offered by one or more trustworthy sellers, if not more.

Negative Reviews: Yes, we do take that into account as well! The goods with the majority of bad reviews are filtered out and disregarded when we choose the best-rated one on the market.

These are the standards by which we selected our knife blades. Do we end our process there? Hell no. The most crucial fact about us that you should be aware of is that we regularly update our website with current and pertinent information. We have one more layer of filtration since we place the greatest importance on reader satisfaction. Please let us know if any product included here is incorrect, irrelevant, subpar, or simply out of date. We always value your opinions, and we’ll work hard to make any necessary corrections to our list in response to them.

Why should you believe us?

There are now thousands of possibilities for these products on Amazon, but choosing the best one can be difficult and time-consuming. And what knife blades should you purchase in 2022?

This guide is the result of more than 10 years of experience in researching, testing and writing about many topics. Each member of our team is an authority in their area. We read every article we could find online and every consumer review on every retail website for seven hours. Additionally, we discovered a ton of websites that offered helpful resources, including buying tips and thorough information on knife blades.