1.OEM precision machining part according to drawings ... used in the automobile, construction equipment hydraulic industry and etc.1. Material Available: Copper, Brass, Aluminum, Stainless Steel, Steel ... Treatment: Plating, anodizing, black oxide etc.7. QC 1) Technicians self-check in production 2) Engineer spot check in ... at:Tel: 86-757-26385090 TM: changzedianqi Hexagon Socket Set Screw With Cup Point