centrebolt, bolt, center bolt Certificate: ISO9001:2000 High Quality Strengthen: 10.9, 12.9 Meterial: mild steel, 45#steel,40Cr steel Thread pitch: 1.56mm, 2.0mm, 3.0mm Finishing: zinc plated, phosphate, black Oxide.... Outer packing: standard neutral carton box fastened with pallet Satisfactory services: We can produce centre bolts as per your drawing and/samples. We can supply package by your design. Other services can be consulted in dealing. Any inquiries, please send to us. We will answer you asap with our rock bottom prices. Thank you in advance!