... can do testing of hardness, salt spray test, coating and so on.SPECIFICATION:MATERIAL: LOW CARBON STEEL, C1045, ... BRASS, ALUMINIUM, AND OTHER MATERIAL REQUIRED BY PRINTS.FINISH: COMMON BLACK POWDER ... ANY SPECIAL REQUIREMENTS OF MATERIAL, FINISH, HARDNESS, PACKING AND SO ON, PLS GIVE US THE DETAIL OR PRINTS ... HAVE THE CHANCE TO WORK WITH YOU. metal pins and fasteners