Copper MACHINE SCREW 1.ISO,ANSI,JIS,DIN,BS& non-standard fastener supply 2.ROHS is capable 3.Grade:4.8 ,6.8,8 ... .8,9.8... ..... Copper MACHINE SCREW, brass shoulder bolt screw ,BRASS ALLEN SCREW. A good non-standard ... "A","AB", Threads for chipboard screw,wood screw,drywall screw;Type "M","UNC","UNF","BSW"threads for Machine threads.Head typesHexagon head,Mushroom head ...