... resistance -Mirror surface -High density -High hardness With glazed surface polished zirconia plunger Features:1.Use temperatures up to ... , oil drilling equipment, Insulation parts in electrical equipment , ceramic knife, ceramic hair clipper spare parts, with high density, bending strength ... 005Parallelism0.01Planeness0.005Roughness 0.05Fit clearance0.005 With glazed surface polished zirconia plunger