Alumina ceramics bushing&ceramic structure part Industry ceramic Wear resistance High hardness Used in machine Features:1) ... to customer's drawings, samples and performance requirement.Our industrial ceramic parts include, tube, rod, plate, disc, wafer, ring, seal, ... .005Straightness 0.005Parallelism0.01Planeness0.005Roughness 0.05Fit clearance0.005 Alumina ceramics bushing&ceramic structure part