Cornwell Tools CAT555 Gearless Angle Die Grinder 20,000 Rpm New Sealed Box Description Value Free Speed 20,000 RPM Collet Size 1/4" Length 6.75" Weight 1.5 lbs. Sound Level 80 dBA Rec. Air Pressure 90 PSI Avg. Air Consumption 3 CFM Rec. Hose Size 3/8" Air Inlet 1/4" NPT