... on the flat surface 2.metal marking machine 3.pin marking machine 4.marking on the mechanical part Marking ... flatness not exceeding 3mmApplicable Scope: Motor part, Mechanical part, Machine tool, Hardware product, Valve, Pump valve, Electro-mechanical equipment, ... etc.(2) Mechanical Industry: to marking on Mechanical Part, Machine tool, Hardware Product, Steel Tube, Sleeve, Collar, Roller, Pump ...