Grinder Head Type Standard Head Grip Style Barrel Grip Voltage 20V DC Wheel Diameter 4 1/2 in 5 in For Wheel Type Type 27 Brushless Motor Yes Cordless Tool Kit Contents (1) Bare Tool Safety Features Anti-Kickback Clutch Brake Lock-Off Switch Switch Type Paddle Lock-Off Switch Yes Lock-On Switch No Brake Type Electronic Max Speed 9 000 RPM Minimum Speed 9 000 RPM Number of Speed Settings 1 Spindle Thread Size 5/8 in-11 Anti-Restart Technology No