... 6.8,8.8.. Special screw,special head screw,special machine screw 1.What’s the specification of our Products ? ... can use other materials accordingto customer's demand .ThreadType "M","UNC","UNF","BSW"thread are available.Head typeHexagon head,Mushroom ... as drywall,concrete,chipboard,machine,wood...2)Main export market:North America,South America,Eastern Europe,Asia,Western Europe .3)Service:OEM service ...