... or StandardMaterial:Carbon steel, Stainless steel ,Copper, Alloy SteelSurface:Plain, zinc plated,HDG, phosphate,Zinc Flake ... fasteners made of low and medium carbon steel, alloy & stainless steel, aluminum, brass or other special ... GB, ISO and other standard&non-standard specifications base on our customers’ special request and drawings.We ... us ” Special nuts and bolts / base on customers'drawing