... powder coating, black oxide. a. Through ISO9001 & ISO 9002 certificates.b. 5-500T stamping machines, punch machine, bending machine, drilling machine ... ALSO SPECIALIZED IN MAKING VARIOUS HINGES, IF YOU HAVE ANY SPECIAL REQUIREMENTS OF MATERIAL, FINISH, HARDNESS, PACKING AND SO ON, PLS ... . HOPING WE CAN HAVE THE CHANCE TO WORK WITH YOU. Special V shaped Metal hinges