... 4 ISO9001:2008,BV,RoHS,REACH brass or aluminum male female connector Materials: iron, carbon steel, stainless steel ,aluminumFinish ... machines,automatic milling machineslathes, tapping machines, screw machines, thread rolling machine, rolling machine, drill press, punch ... degree of precision instrument, hardness gauge,various gauges, thread gauge, digital display micrometer, dial indicator, mm card ...