... part 1.Material:steel 2.Process:turning surface treatment:no professional manufacturer steel machining drilling part :Material:steelsurface treatment: ... details: ProcessingCNC Machining, Turning, Milling, Stamping, Die Casting, injection mould,4&5 axis machining Applicable MaterialAluminum/zinc alloy, iron ... term,thank you in advance. professional steel machining part with no surface finish custom parts