... ,6.8,8.8.. Special screw,special head screw,special machine screw 1.What’s the specification of our Products ? MaterialCarbon ... requests .additional process Washer assembly,Heat treatment,Baking hydrogen,Anti-slipping patch can be proceeded if customer need 2.Why should ... used in most of places such as drywall,concrete,chipboard,machine,wood...2)Main export market:North America,South America,Eastern ...