... surface with flatness not exceeding 3mmApplicable Scope: Motor part, Mechanical part, Machine tool, Hardware product, Valve, Pump valve, ... part can be marked without Labeling Fixture (some require a simple fixture to fix the marking position of product.)Major parts: Main Machine ... , etc.(2) Mechanical Industry: to marking on Mechanical Part, Machine tool, Hardware Product, Steel Tube, Sleeve, Collar, ...