... to work pieces at a high frequency under the application of compressed air, to form the edited information on work pieces.Major function ... Mechanical Part, Machine tool, Hardware Product, Steel Tube, Sleeve, Collar, Roller, Pump Valve, Ring Flange, Valve and Fastener, etc.( ... marking speed)Marking Material: Metals or Non-metals with hardness under HRC55Marking Depth: 0.02-1.5mm (adjustable, relevant to ...