... ;Type "M","UNC","UNF","BSW"threads for Machine threads.Head typesHexagon head,Mushroom head,Pan head ... flange head,Round head,Ball head,Button head...Socket typesPhillip type,Pozi type,Eleven type,hexagonal ... ,it is strong not break down . meanwhile,socket is much deeper,it is convenient to tighten ... most of places such as drywall,concrete,chipboard,machine,wood...2) Main export market:North America, ...