GRS Ultra 850 Rotary Turbine Handpiece & foot control Assembly Like new condition. GRS Description This rotary handpiece turns 320,000 RPM for effortless engraving, decorating and grinding on almost any material. It is free from vibration and noise, and contoured shape for enhanced comfort. It only accepts 1/16 (1.6mm) diameter bur shanks.Connects directly to GraverMach, GraverMax SC or any regulated air supply. The item "GRS 850 Turbine (Rotary) Handpiece & Foot Control Assembly" is in sale since Sunday, September 11, 2016. This item is in the category "Jewelry & Watches\Jewelry Design & Repair\Jewelry Tools\Engraving Tools". The seller is "windyridgedesigns" and is located in Reno, Nevada. This item can be shipped to United States.