... >through TS16949 certificate 1.Size: according to the drawing.2.Material: carbon steel, alloy steel, stainless ... nitrogen treatment, carburizing hardened.6.Process: stamping, deep drawing, welding, sheet metal fabrication, and metal assembly.7. ... double-sided grinding machine,2 sets of automatic tube bending shrink mouth machine, Companies self-contained, ... -selling of Auto hardware metal tube