Mini Die Grinder. This compact mini die grinder is lightweight for easy maneuverability. Built in regulator matches the speed to the job. The rear exhaust directs the air away from the work. Ribbed handle design for a positive grip. Lock off throttle to prevent accidental start up. 1/4" collet accepts all 1/4" shank grinding burrs and stones. (Be sure your burrs, stones, etc. are rated above 28,000 rpm). Maximum free speed: 28,000 rpm. Average air consumption: 4 cfm @ 90 psi. Length: 4 3/4". Weight: 3/4 lb. 1 year limited warranty.