... are acceptable. 4.Machining tolerance:0.02mm Material we can work on: Aluminium: ASTM 380,2017,2011,2024,5052 ... 1015,1030,1045,1060,12L14,1144,4140,4130 etcBrassCopperBronzeIronZinc alloy etcFinish we can provide:Black anodize, Clear anodize, Hard anodize, ... Natural oxidation, Black oxidation,hot galvanizedPlating: Zinc, Nickel,Silver,Tin, ...