... .Aluminium,brass,stainless steel,steel 3.Machining,milling,grinded,polished. 4.Tolerance:+/_0.01mm Milling parts & CNC machining parts 1,Material: Brass ... , Carbon steel, Aluminium etc 2,Machining process: CNC turning, Milling, Drilling, CNC lathe etc 3,Surface treatment: Plating with Zinc, sliver, Nickel ...