... us.product specificationsItem.NOHHC-hz008Namesteel sleeve bushingsMaterialIron, Stainless Steel, Brass, Al, Copper, etcSurface treatmentZinc, Copper Nickel, Chrome, Tin, ... (CRS), Mild steel, Stainless steel, Aluminum, Phosphor Copper, Brass, etc. (According to customer's demands)2 ... Surface finish: Zinc, Nickel, Chrome, Tin, Silver, Copper, Gold Plated, Painting, Anodizing Heat treatment, Black Oxid ...