... stainless,aluminum alloy 2.Finish:zinc plated,powder coat carbon bicycle steel frame Strictly quality control by 100% inspectionSmall quantity ... machining,threadingSurface finishingzinc plating, hot dipped galvanized, powder coat, e-coat, polishing,chrome plated,nickel platedAdvanced equipments2000T hydraulic press machine ... cutting machine, hacksaw cutting machine and so on. carbon bicycle steel frame