... order accepted 1. Material Available: Copper, Brass, Aluminum, Stainless Steel, Steel alloy, etc.2. Specification: OEM, according to customers' drawing ... CNC lathe, automatic lathe, hand lathe, thread rolling machine, tapping drilling machine etc.6. Surface Treatment: Plating, anodizing, ... black oxide etc.7. QC 1) Technicians self-check in production 2) Engineer spot check in production ...