Copper MACHINE SCREW 1.ISO,ANSI,JIS,DIN,BS ... 8.8,9.8... ..... Copper MACHINE SCREW, brass shoulder bolt screw ,BRASS ALLEN SCREW. A good non-standard fastenerS manufacturer ... Threads for chipboard screw,wood screw,drywall screw;Type "M","UNC","UNF","BSW"threads for Machine threads.Head typesHexagon head ... most of places such as drywall,concrete,chipboard,machine,wood...2) Main export market:North America ...