Specifically designed to cut through thick materials, the 2-1/2 in. Roofing Hook Blades with Dispenser (50 PK) are ideal for materials like asphalt roofing shingles, carpets, and linoleum. The hooked shape of the blade prevents damage to materials beneath the cutting surface. Heavy-duty high carbon steel design keeps blades from breaking on tough jobs. These blades fit most utility knives.