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 fastenerS manufacturer ... Products ? MaterialsCarbon steel,Stainless steel,Alloy steel,Copper,Aluminum are available.Carton steel is high ...