Great for tight or angled grinding jobs that an inline die grinder won't reach.The rugged all ball bearing motor provides up to 20000RPM and the efficient front exhaust air flow systems is preferred by profession everywhere.Specifications:Collet Size : 1/4"No-Load speed: 20000RPMAir Consumption: 4 CFMAir Pressure: 90 PSIAir Inlet: 1/4" NPTAir Hose Size: 3/8" ID