... marking type: NCQ/E-250/320/400/500F luxurious type: NCQ/F-135/200/250Principle of pneumatic marking: Through computer control, the marking ... to mark on workpieces such as machinery components, machine tools, hardware products, steel pipes, casing ... two rails that other same kind of pneumatic marker machines adopt, therefore, greatly improve degrees of exquisiteness and achieve high-speed punch marking ...