16pc air die grinder kit 1) Free Speed:22,000 rpm 2) Air Consumption:4.0cfm 114l/min 3) Collet:1/4" ,1/8" 6.0mm,3.0mm 16pcs Air Die Grinder Kit Technical Data:Free Speed:----------------------------22,000 rpmAir Consumption:-------------------- 4.0cfm 114l/minCollet:------------------------------------1/4" ,1/8" 6.0mm,3.0mmAir Exhaust:----------------------------RearLength ...