... a group of operators who are specilized in CNC turning parts. 1. Material: Carbon steel; Stainless steel, aluminum alloy; ... rolling, stamping, deep drawing, bending, spot or seam welding, spinning, forging, sand casting, die casting, investment casting, etc. 3. Surface treatment ... a regional leading manufacturer, we specialize in producing machining parts, we have rich experience to do OEM work and ...