Carbon Steel Iron Door Heavy Duty Bolt 1) Material: steel, iron; 2) Size: 80mm, 100mm, 120mm, 150mm, 200mm; Product Information:Carbon Steel Iron Door Heavy Duty ... Bolt1) Material: steel, iron;2) Size: 80mm, 100mm, 120mm, 150mm, 200mm ... per carton, or as per customer's request. Carbon Steel Iron Door Heavy Duty Bolt