... power,little noise,operate safe SD-150 Face Air Grinding Wheel Air grinder ID ITEM UNIT PARAMETER 1 Wheel size( ... diameter×thickness×inner diameter) mm 150×6×22 2 Air pressure Mpa 0.63 3 Free speed r/min10000 ... mm180×66×150(1)This tool is portable face air grinding wheel,High efficiency,small volume,little weight,high pwer, ... metal shield, for operation safety. SD-150 Face Air Grinding Wheel Air grinder