Tolerance (+/-mm) we can reach:CNC Machining: 0.005Turning: 0.005Grinding(Flatness/in2): 0.003ID/OD Grinding: 0.002Wire-Cutting: 0.002Surface Treatment we can offer: Clear/color anodized; Hard anodized; Powder-coating; Sand-blasting; Painting;Nickel plating; Chrome plating; Zinc plating; Silver/gold plating; Black oxide coating, Polishing etc...