Air engraving pen with a hardened metal stylus allows for precision engraving with permanent identifying markings. Ideal for professionals or DIYersSuitable for use on plastic as well as metals including hardened steel (e.g. toys, sporting goods, jewelry, watches, phone chargers etc)Steel body with knurled grip and on/off control and forward facing air discharge for added comfort. Working Pressure: 6.2 bar. Stroke Speed: 13,000 bpmSupplied with 4.92 foot connection cable with 360 degree swivelling air inlet to avoid interference from the air lineAir inlet: 1/4 inch. Vibration: 2.5 m/s squared. Sound Level: 78 dB. Sound Power Level: 90 dB