It is a professional tool for cutting, chamfering, grinding, carving, internal processing and polishing. It's designed for application of metal, wood, porcelain, stone, , aluminum gift, bracelet, etc. Features: Portable size, light weight, pen-shaped design, convenient to use with one hand. Accurancy designed blade grinder, safe and practical. High-speed rotation, adapt to high-speed accurancy machining. Sophisticated interior design and coreless vibration ensure long time operation. Rear air exhaust to prevents the scraps flying or scattering, low noise. Easy to use, easy to assemble and disassemble. Specifications: Color: red Speed: 58000 RPM Collet Size: 3mm Type: Grinder, Polisher Length of Pen: 132mm / 5.2in Air Pressure: 90 PSI Average Air Consumption: 60 L/min Package Size: 225 * 110 * 52mm / 8.9 * 4.3 * 2.0in Package Weight: 290g / 10.2ounce Package List: 1 * Air Grinder 2 * Spanner