... the automobile, construction equipment hydraulic industry and etc.1. Material Available: Copper, Brass, Aluminum, Stainless ... 01mm4. Processing: turning, milling, drilling,casting,stamping etc.5. Equipment: CNC lathe, automatic lathe, hand lathe, ... black oxide etc.7. QC 1) Technicians self-check in production 2) Engineer spot check in production ... : changzedianqi Hexagon Socket Countersunk Head Screws