Specifications: Free speed: 25,000 RPM Air inlet (PT): 1/4 in Air hose(ID): 3/8 in Avg. air consumption: 3.2 SCFM Working pressure: 90 PSI (6.3 BAR) Lever lock throttle for safety. Built in regulator . Lightweight aluminum housing with bicolor soft grip. 1 in extended collect tube to reach deeper area or tighter space. Also available for 1/8 in (3mm) collet (optional). Used with a variety of accessories for weld breaking, smoothing sharp edges, deburring, polishing and grinding. Rear exhaust.