flanges: High precision,and high quality precision mechanical components high precision/royal precision engineering components:flangesHigh precision,and high quality precision mechanical components ,used on extrusion press.Specification:Material: H13, 42CRMO, 35CRMO, 40CRNIMO, 304Standard :ISO9001:2000, ISO14000Range of diameter : 50MM-5000MMSurface accuracy: 0.001 flanges