Extend the life of used tires by removing a thin, hardened layer of rubber. Heavy duty 7" Milwaukee sander with 2.25 HP/13 amp motor, has a 0-6000 adjustable RPM range to compensate for varying tire hardness and features a 10 ft detachable cord. Backing pad and discs are sold separately. Tech Tip: You’re grinding too fast if you see blue smoke while grinding. Lower the rpm under the smoke range for best results.