Joint Connector Bolts 1.Material:copper/brass/bronze 2.Tech:cnc turning/ ... stamping, casting, forging, machining parts with differentmaterials, such as brass, aluminium, steel, stainless steel, zinc. Our strong R&D and QC ... stamping, casting, forging, machining parts with differentmaterials, such as brass, aluminium, steel, stainless steel, zinc. Our strong R&D and QC ...