Material: steel, iron; Surface finish: zinc or colour zinc plated; Size: 80mm, 100mm, 120mm, 150mm, 200mm Product Information:1) Product Name: Heavy Duty Bolt2) Material: steel, iron3) Model No.: JMTB-274) Surface finish: zinc or colour zinc plated5) Size: 80mm, 100mm, 120mm, 150mm, 200mm6) Packing: 6-12pcs per inner box, 8-18boxes per export carton, or as per customer's request. Heavy Duty Bolt