Wheel Diameter: 7"Voltage: 120VAmperage: 15.0ANo Load RPM: 8,500Spindle Thread: 5/8"-11 UNCPowerful 15.0A Ultra-Efficient 4-HP Motor Delivers Stronger Performance And Lasting ReliabilityService Minder Brush System Eliminates Guesswork , Stops Tool When Preventative Maintenance Is RequiredEpoxy-Coated Field Windings Provides Protection Against Abrasive Dust And Metal DebrisTri-Metal Switch Design Helps Prevent Accidental Start UpsRemovable Brush Covers For Quick And Easy Brush ReplacementAC/DC Compatibility Extends Tools Versatility To DC Outlets Such As Welders And GeneratorsNo-Lock-On Switch Helps Prevent Accidental Start Ups And Shuts Tool Off If Control Is LostMain Handle Rotates 90 Degrees For Better Control In Cutting ApplicationsIncludes Grinder, Wheel Guard, Handle, Flange Nut Set And Spanner Wrench