Features: 1) Lever lock throttle for safety. 2) Built-in regulator 3) Lightweight aluminum housing adds durability 4) Used with all types of accessories for porting, weld breaking, Smoothing sharp edges, deburring, polishing and grinding 5) Rear exhaust Specifications: 1) Free speed: 22, 000rpm 2) Bolt size: 1/4" (6mm) 3) Air inlet: 1/4 " 4) Air hose (ID): 3/8 " 5) Average air consumption: 4cfm (115L/min) 6) Suggested air compressor: 1. 5HP Inner packing: Color box Outer packing: 20pcs/ctn Carton dimensions: 38 x 19 x 21cm