Angle Die Grinder Set This set is compact and lightweight for ease of maneuverability that is ideal for most industrial applications. A rotating air inlet is designed for ease of movement, and offers a low noise ratio of 77dB. This 0.3 horsepower motor offers 20,000 RPM, while the ergonomically designed comfort cushion grip and regulator allow for easy control of the RPMs. Features include... 20,000 RPM 0.3 Horsepower 1/4" Collet 4 CFM @ 90 PSI NPT air inlet: 1/4" Length: 6 5/8" 10 different grinding wheels