... needDeep processingextrude, precious cut, punch, drill, tap, mill, rivet, welding etcQualityHigh corrosion resistance, high weather resistance and good wear resistanceClient’s ... of Quality: According to the standard of China “GB/T5237-2000”, “GB/T6892-2006 High Degree Standard"5. Type: With 20 years ... the mould will be free. aluminium ventilation grilles with high quality and competitive price