Joint Connector Bolts 1.Material:copper/brass/bronze 2.Tech:cnc ... kinds of metalparts. We are making stamping, casting, forging, machining parts with differentmaterials, such as brass, aluminium, steel, stainless steel, zinc ... kinds of metalparts. We are making stamping, casting, forging, machining parts with differentmaterials, such as brass, aluminium, steel, stainless steel, zinc ...