Material: Low Carbon Steel. Finish: White Zinc. Through ISO 9001 & ISO ... , salt spray test, coating and so on.SPECIFICATION:MATERIAL: LOW CARBON STEEL, C1045, AND OTHER MATERIAL REQUIRED BY PRINTS.FINISH: COMMON BLACK POWDER ... MAKING VARIOUS HINGES, IF YOU HAVE ANY SPECIAL REQUIREMENTS OF MATERIAL, FINISH, HARDNESS, PACKING AND SO ON, PLS GIVE US THE ...