... 6.8,8.8,9.8... ..... Copper MACHINE SCREW, brass shoulder bolt screw ,BRASS ALLEN ... ;Type "M","UNC","UNF","BSW"threads for Machine threads.Head typesHexagon head,Mushroom head,Pan ... each year ISO Quality person come into factory for Supervising inspecting. "integrity, in accordance with the ... for your best view:1) applicable scope:They are used in most of places such as drywall,concrete,chipboard,machine ...