Grinder, Grip Style Barrel Grip, Voltage 18V DC, Wheel Diameter 4 1/2 in, 5 in, Brushless Motor Yes, Safety Features Anti-Vibration, Switch Type Paddle, Max. Speed 8,500 RPM, Minimum Speed 3,500 RPM, Speed Ranges 3,500 to 8,500 RPM, Number of Speed Settings Continuous, Spindle Thread Size 5/8 in-11, Guard Adjustment Toolless Adjustable, Anti-Vibration Technology Yes, Anti-Kickback Clutch Type Electronic, Electrical Protection Overload Protection