Features: 1. The head of the pen adopts special alloy steel, quick operation, flexible and comfortable to use. 2. Depending on the difference of the material, depth may be up to 1 mm. 3. The main body is made of high quality synthetic material, lightweight and convenient to use.4. Compressed air, energy saving and eco-friendly. Noise reduce intake pipe, comfortable to use.5. Works great on metals, wood, plastic, glass, stone, china and other hard material, great for marking tools, components, and more.Specification:Item Type: Pneumatic Engraving PenMaterial: Aluminum alloy, Iron, Steel Model: KP-612No-load Speed: 3800 times / min Working Pressure: 0.6 mpa Inlet interface: 1/4" Noise Reduction Tube: 1.5m Package Weight: Approx. 309 gPackage Include: 1 * Pneumatic Engraving Pen