Features: Pencil type micro air die grinder features a variable speed throttle control for any speed up to 58000 RPM and has a self closing lever. It's ideal for cleaning and polishing of jewerly, porting cyline heads, dies or any hobby and craft uses. Includes 10 different styles of grinding stone bits, but the 1/8" collect allows this micro grinder to be used with a large variety of 1/8" dremel tool bits. Has a extremely flexible 50" hose with an abrasion guard that allows you to reach the most diffiult areas. It's slim, lightweight, durable and comfortable to hold and use. Comes with an automatic inline oilier with starter bottle machined oil. Specs: Free speed.........................65,000 PRM Collect size.........................3mm or 1/8" Net weight...........................0.33 KGS Length.................................132mm Air pressure.........................90 PSI