Featuring an intelligent deep hook design, Superior Steel Hook Blades are perfect for easy trimming of roofing materials, carpet fabrics, sheet materials, floor coverings, and linoleum. These blades fit most standard utility knives. Now get the quality job done with efficiency and convenience. Fits the standard retractable utility knife. They are double sided and can be easily flipped over for a new blade installation. This super hooked blade is exactly as the standard hook but deeper and more of an inner curve. Quick and easy cutting waste when sizing.