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CNC Machining Custom Parts Diy CNC Milling Machine Parts. About us. Q: Who we are? A: YIJIN Hardware Co., Ltd, reliable stainless steel precision Milling Machine Parts manufacturer. YIJIN Hardware Co., Ltd specializes in precision CNC Machining and provides OEM ODM service:CNC machining/Milling/turning parts, Casting Parts, Metal Stamping Parts, etc.