FLEXVOLT 60-Volt MAX Lithium-Ion Cordless Brushless 4-1/2 in. Angle Grinder w/ Batteries and Bonus 1/2 in. Impact Wrench13 Amp equivalent motor as compared to a D28144 corded unit Brake engages when trigger is released, stopping speeds of 1. 5 seconds with standard grinding wheel (4 1 2 in. x 1 4 in. bonded abrasive wheel, non hubbed) Kickback brake engages when a pinch, stellar bind up event is sensed and the electronic brake engages with maximum force to quickly stop the wheel, reduce the movement of the grinder and shut the grinder off E clutch activates in less