Voltage: 120V ACAmperage: 4.5ANo Load RPM: 21,000Collet Size: 1/4"Designed For Continuous Use In Tight Spaces And On Irregular SurfacesIdeal For Grinding, Shaping And Deburring Workpieces Of Various Shapes And DiametersIncludes A 1/4" Collet And Will Accept A 1/8" Collet For Increased UtilityFeatures All Ball And Roller Bearings For Durability, And An On/Off Toggle Switch For Convenience On Continuous Use ApplicationsIncludes Tool, 1/2" Wrench And 11/16" Wrench