Galanized Bolt with nut washer: 1.Carbon stel,stainless,steel,brass,ect 2.Surface Protection:Plain,Black,DACROMGT Galanized Bolt with nut washer:GB/1228-1231-91Mainly used for:High Steel Contraction Building Work Houses, Power Stations,Bridge,Railways,Cranes,Airplane Storeroom,Etc.1.Carbon Steel, Stainless steel, brass,etc2.Surface Protection:Plain,black,DACROMGT