... by Fringe-milling, rolling, stamping, mouth-narrowing/broadening, hole/bore-making, surface-grinding, mouth-broadening, mouth-shrinking, bending,sharpening,and ... B. It's made of aluminum alloy, not rest easy.C. It's aluminum alloy bent pipe, good for many ... B. 2500 square meters workshop and over 50 workers. C. Equipments: CNC machines, bending machine, Automatic spark machine, line cutting machine, ...