Heavy Duty Tower Bolt 1) Material: steel, iron; 2) Size: 80mm, 100mm, 120mm, 150mm, 200mm; 3) Surface finishl: zinc plated. Product Information:Heavy Duty Tower Bolt1) Material: steel, iron;2) Size: 80mm, 100mm, 120mm, 150mm, 200mm;3) Surface finishl: zinc, color zinc plated,4) Packing: 12pcs or 6pcs per inner box, certain boxes per carton, or as per customer's request. Heavy Duty Tower Bolt