Ivy Classic heavy duty utility blades are made in the USA of high carbon steel for long-life and durability. Their precision-honed sharpened edge makes clean, accurate cuts. The edge can be re-sharpened. The blades cut drywall, roofing materials, Linoleum, carpet and vinyl. The blades fit all Ivy Classic retractable (11150, 11152, 11151), fixed (11154) and Folding (11145, 11146, 11147) utility knives and other standard utility knives. Blades are 0.025″ Thick and have 2 notches. Ivy Classic Industries is dedicated to producing a comprehensive, quality line of power tool accessories and hand tools.