... , milling machine.c. We can do testing of hardness, salt spray test, coating and so on.SPECIFICATION:MATERIAL: LOW CARBON STEEL ... 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