This rotary handpiece provides 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. No lubrication required. It only accepts 1.6 mm diameter burs with FG-shanks. Connects directly to a GraverMach® AT, GraverMax® G8, or any regulated air supply. The GRS Ultra 850 High Speed Handpiece uses external compressed air (min. 2 - 2.5 bar, 38 l/min.).