*Free Speed: 25000 rpm *Air Pressure: 90psi *Hose Size: 3/8" *Inlet Size: 1/4" *Air Consumption: 3.2 cfm * Collet Size: includes 1/4" collet *Designed for High Speed Grinding & Polishing In Hard to Reach Area, Professional design, Has collets allowing you to use 1/4" shank tools. *Ergonomic handle for ease of use and to alleviate hand fatigue.