Aluminum die casting part/Chair Base Conforms to ISO9001 standard ... Heat treatmentHardened, NitridingHardnessHRC50~55Mould featuresAdvanced design, Logical structure, High precision, Qualified materials, Long lifetime, Short delivery time ... .ProcessCasting, Deburring, Machining, Surface Treatment, Packing.Surface treatmentHigh quality polishing, Chrome/nickek/Zinc(white, blue, yellow, black)plating ...