Avg. Air Con.:4 Air Inlet:1/4”~18NPT Air Pressure:90PSI Free Speed/Feed Speed(RPM):18,000 Collet Size:3/8"(9.5MM) Sound Level Db:82 Vibration (m/s2):0.1 Air Exhaust Style:REAR Packing:12PCS/CTN/11KGS/0.8’