DELTA SHOPMASTER Model GR275 6" Variable Speed Grinder with Tool-less Quick Change with a 2 amp, 120V/60 Hz, 2000-3450 RPM induction motor; flexible lamp; tool rests; eye shields; spark deflectors; grinding and white friable sharpening wheels; wrench and diamond; wheel dresser and instruction manual. Delta Model GR275 Features: Patent pending quick change nut and tool-less wheel cover for ease of wheel change White friable wheel for sharpening Tool-less quick change Grinding wheel Powerful 2 amp induction-type motor for long-lasting, smooth performance Adjustable tool rests compensate for wheel wear Variable speeds (2000-3450 RPM) Cast-iron base Flexible gooseneck lamp Delta Model GR275 Specifications: Motor -- 2 amp Shaft Diameter -- 1/2" Wheel Diameter -- 6" Motor Control -- On/Off switch with speed control Wheels: Face: 3/4" Hole: 1/2" Weight -- 25 lbs.