Perfect for replacing worn out blades, these #11 hobby knife replacement blades are compatible Excel Blades K1, K3, K17, K18, K26, K30, & K71 handles. The carbon steel angled edge single blade allows you to achieve intricate precision every time. A suitable choice for architects, graphic artists, designers, hobbyists, wrappers, scrapbook artists and crafters alike, this hobby knife blades assortment are the new mainstay of your DIY kit.