... .ISO certificate 5.Over 10 years experience Stainless Steel Tube Stamping bushing About Product NO. ... cold rolled steel, alloy steel, bearing steel, stainless iron, stainless steel; ductile iron etc.4FinishPlainPassivated; Polishing;Zinc plated ... stampingStamping - Rolling, forming, punching, bending, deep drawing.Metal fabrication (machining) - Wire EDM, drilling, turning, milling, grinding.Welding ...