General Duty Die Grinder. This general duty die grinder is best suited for the occasional user or the do-it yourself-er. It has a built-in regulator that matches the speed to the job. The rear exhaust directs the air away from the work. Ribbed handle design for a positive grip. 1/4" collet accepts all 1/4" shank grinding burrs and stones. (Be sure your burrs, stones, etc. are rated above 22,000 rpm). Maximum free speed: 22,000 rpm. Average air consumption: 4 cfm @ 90 psi. Length: 5 3/4". Weight: 1 1/4 lb. 1 year limited warranty.