... parts 1. Material:carbon steel,stainless,aluminum alloy 2.Finish:zinc plated,powder coat carbon bicycle steel frame Strictly quality control by 100 ... fifth wheel, lift platform, garage, hardware, crane partsMaterialcarbon steel, stainless steel, aluminum alloy, copperProcedurewelding,stamping,cutting,punching,bending,grinding,machining, ... , hacksaw cutting machine and so on. carbon bicycle steel frame