Alumina ceramics bushing&ceramic structure part Industry ceramic Wear resistance High hardness Used in machine Features: ... , plate, disc, wafer, ring, seal, bearing, valves, pump plunger, beam, roller, shaft, screw, washer, sleeve, hunger, spacer, holder, carrier, insulator, scissors ... .005Roughness 0.05Fit clearance0.005 Alumina ceramics bushing&ceramic structure part