THE ROOFING BOLT  MATERIASL IS STEEL

THE SIZE IS  1/4" X 250MM , M6X250MM- 300MM ,

                     M7X 250MM-300MM ,M8X250MM-300MM

ONE SET IS ONE BOLT + ONE NUT + 2PCS STEEL WASHER + 2 PCS SBS(bitumen) washer.

the packing is 200-300pcs bolt per one plastic bag

                     200-300pcs nut per one plastci bag

                     200-300pcs steel washer per plastic bags

                     200-300pcs SBS washer per one carton.

min order is 200000sets.