... die casting aluminium 1.machine screw size,M3-M36 2.carbon, stainless steel 3.zinc plated,black,etc 4 ... plating, chrome plating, yellow passivation, gold passivation, galvanizing, satin, etc.2.Processing Method: cnc machining, turning, milling, drilling, grinding, broaching, ... welding and assembly.3.Variety of standards:ISO,GB,DIN,JIS,ANSI4.ISO9001-2008,SGS,ROHS ...