Carbide-Coated Rasp Design: Copper-colored tungsten carbide surface delivers maximum rubber removal for fast inner liner preparation in heavy-duty repair conditions. Built for Tire Repair: Ideal for prepping the inner liner before patch or plug installation, aggressively removing damaged rubber and creating a strong bonding surface. 23 Grit Coarse Cutting: Extra-coarse grit provides maximum material removal, making it ideal for larger injuries, tough rubber, and demanding high-volume repair work. 2-1/2.