... 8,8.8,9.8.... SMALL MACHINE SCREWS,STAINLESS STEEL SCREW,CHIPBOARD SCREW MACHINE SCREW . A good non-standard ... threads for Machine threads.Head typesHexagon head,Mushroom head,Pan head,Countersunk head,Bugle head,Oval head,Hex flange head,Round head,Ball head,Button head...Socket ... factory for Supervising inspecting. "integrity, in accordance with the national standards, do not jerry-build ,all ...