... ;Type "M","UNC","UNF","BSW"threads for Machine threads.Head typesHexagon head,Mushroom head,Pan head ... container :22.6T-25.5Tadditioal processes Washer assembly,Heat treatment,Baking hydrogen,Anti-slipping patch can ... Head is much thicker ,it is strong not break down . meanwhile,socket is much deeper,it ... most of places such as drywall,concrete,chipboard,machine,wood...2) Main export market:North America ...