Carbide-Coated Rasp Design: Copper-colored tungsten carbide surface delivers aggressive rubber removal for fast inner liner preparation in demanding repair conditions. Built for Tire Repair: Ideal for prepping the inner liner before patch or plug installation, quickly removing damaged rubber and creating a strong bonding surface. 36 Grit Aggressive Cutting: Coarse grit provides fast, heavy material removal, making it ideal for larger injuries, tough rubber, and high-volume repair work. 2-1/2.