we can work on: steel, S.S, aluminum, brass, copper, plastic etc. finish: grinding, polishing, plating, anodizing, oxide, powder coating. Tolerance we can reach:Flatness - 0.00005" / 0.0012mmStraightness - 0.00006" / 0.0015mmCircularity - 0.0001" / 0.0025mmCylindricity - 0.0001" / 0.0025mmParallelism - 0.00005" / 0.0012mmRunout - 0.00005" / 0.0012mmSymmetry - 0.00012" / 0.003mmConcentricity - 0.00005" / 0.0012mmSquareness - 0.0001" / 0.0025mm