Positive grip - 1/4" capacity collet chuck.Compact and lightweight.Lever throttle for featuring control.Front exhaust. Specifications: Collet Size: 1/4" Free Speed: 20,000 RPM Overall Length: 5" (127mm) Net Weight: 13/16 lbs. (.31kg) Motor: 1/3hp Air Inlet Thread NPT: 1/4" Air Hose I.D. Size 3/8" (10mm) Avg. Air Consumpt: 3cfm Air Pressure: 90-120psi