Powerful, straight mini air die grinder. Free Speed: 25,000 rpm. Collet: 6mmLightweight and durable with a composite grip for added comfort and support. Total Weight: 14.1 ouncesAir exhaust in the handle to protect against cold air. Air Inlet: 1/4 inch. Minimum Hose Size: 3/8 inchSilencer for noise reduction and quieter operation. Sound Level: 81.78 dB(A). Vibration: 5.42 m/s squaredSafety throttle lever to avoid accidental operation.