... brass, aluminium 3.zinc plated,hdg,black carriage bolt Itemcarriage boltMaterial of carriage boltCarbon steel(,Q235,C1010,C1020,C1040,10b21 ... ,grade10.9,grade12.9ANSI,ASTM:grade2,grade5 grade8Finishing of carriage boltColoured zinc-plated(galvanized,can be white, ... bags+chipboard carton(20x20x15cm)our products 1.All of our products were tested by professional testing organization, ...