... technique requirements,Website:http://www.bending-tube.com, before running ,we would like to provide formal material certificate showing chemical compositions and property, also ... Processstamping, deep stamping, bending, punching, threading,welding, tapping, rivetingMaterialAluminum, copper, brass, stainless steel, steel, iron, alloy, zinc etc.FinishPolishing; Anodize; SandingPowder ...