... 2.material:stianless/carbon steel, brass, aluminium 3.zinc plated,hdg,black carriage bolt Itemcarriage boltMaterial of carriage ... .9ANSI,ASTM:grade2,grade5 grade8Finishing of carriage boltColoured zinc-plated(galvanized,can be white,blue,yellow,green)Hot ... dip galvanized(HDG)Nickel-plated,Chrome-plated,Tin-plated,DacrometPassivation,Dacroblack,QPQ,Polished,MattSize of carriage ...