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.
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