... Detailed Product Description ITEM Aluminum Die Cast Speaker Parts Die casting mouldCavitySingle or multiple ... treatmentHardened, NitridingHardnessHRC50~55Mould featuresAdvanced design, Logical structure, High precision, Qualified materials, Long lifetime, Short ... , Deburring, Machining, Surface Treatment, Packing.Surface treatmentHigh quality polishing, Chrome/nickek/Zinc(white, blue, yellow, black ...