... MACHINE SCREW 1.ISO,ANSI,JIS,DIN,BS& non-standard fastener supply 2.ROHS is capable 3.Grade:4.8 ,6.8,8.8,9.8 ... ... ..... Copper MACHINE SCREW, brass shoulder bolt screw , ... Type "M","UNC","UNF","BSW"threads for Machine threads.Head typesHexagon head,Mushroom head,Pan ... of places such as drywall,concrete,chipboard,machine,wood...2) Main export market:North America ...