Copper 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, ... screw;Type "M","UNC","UNF","BSW"threads for Machine threads.Head typesHexagon head,Mushroom head,Pan head ... most of places such as drywall,concrete,chipboard,machine,wood...2) Main export market:North America,South America, ...