... powder coat,zinc plated elevator hardware sheet metal part1.Strictly quality control by 100% ... steel, aluminum alloy, copperProcedurewelding,stamping,cutting,punching,bending,grinding,machining,threadingSurface finishingzinc plating, hot ... punching machine, Welding robot, powder coat finishing line ,plasma cutting machine, hacksaw cutting machine, rolling machine and so on. elevator hardware sheet metal ...