Features: These knife blade refills are ideal for cutting wood, scrapbooking supplies, cardboard, paper, plastic, cloth, leather and foam board crafts to suit your different needs. These craft knife replacement blades are suitable for precise projects, models, artwork, delicate, precision cutting, detailing, trimming, stripping and more. Specifications: Material: carbon steel Color: silver Size: 0.5 x 0.34 inch Package includes: 40 x Knife replacement blades Notes: Manual measurement, please allow slight errors in size. The color may exist a slight difference due to different screen displays.Useful Accessories for the Knife: with 4 plastic storage boxes, these square knife blades can be easily stored and carried, giving you a lot of convenience and thoughtfulness. Versatile and Practical: you can use these blades for knife for chiseling, shaving, cutting, scrapbooking, caving, trimming wood, plastic, rubber, wax and other materials as you wish. Long Term Service: these hobby knife blades are made of solid carbon steel, robust and reliable, a pointed and rust proof blades that are easy for you to trim, carve and cut, and serve you for a long time. Easy to Use: each art knife blade measures approximately 0.5 inch for head width, 0.34 inch for tail width, fitting handles of 0.375 inch, and suitable for light duty hobby knives; They are easy to install and use. Package Quantity: the package comes with a total of 40 pieces of #17 precision knife blades, plenty of them to meet your engraving and cutting needs, easy to replace and share.