Master mechanic, 1/4", straight, die grinder kit, ideal for porting, weld breaking, smoothing sharp edges, deburring, polishing & grinding applications, 2500 rpm variable speed, 1/4" collet, sealed ball bearing construction for durability, heavy duty aluminum housing comfort grip, lightweight body, safety lever prevents accidental starts, rear exhaust, 3 cfm at 90 psi air consumption, includes: 10 grinding stones, 2 wrenches, nipple, 1/4" collet & carrying case.