Grinder and Battery Head Type Standard Head Grip Style Barrel Grip Voltage 18V DC Wheel Diameter 4 1/2 in 5 in For Wheel Type Type 1 Type 27 Brushless Motor Yes Battery Capacity 5.0 Ah Cordless Tool Kit Contents (1) Bare Tool (1) Battery Safety Features Adjustable Guard Anti-Kickback Clutch Switch Type Paddle Lock-Off Switch No Lock-On Switch No Brake Type None Switch Location Bottom Max Speed 8 500 RPM Spindle Thread Size 5/8 in-11 Guard Adjustment Toolless Adjustable