Portable size, light weight, pen-shaped design, convenient to use with one hand. 65,000RPM high-speed rotation, adapt to high-speed precision' machining. Has a extremely flexible hose with an abrasion guard that allows you to reach' the most difficult areas. Rear air exhaust to prevent the scraps flying or scattering, low noise. Easy to use, easy to assemble and disassemble. It's perfect for cleaning and polishing of jewelry, porting cyline heads, dies or any hobby and craft uses. Air pressure: 90 PSI Chuck size: 2.38mm (1/10inch) and 3mm (1/8inch) Grip: Pencil Air hose: 1/4inch colour:Silver + red Material:metal Package Contents: 1 * Micro-Air Grinder Pencil 1 * Oil bottle 2 * Chuck 2 * Removing spanners Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.