The 1-9/16” AVT® Rotary Hammer (model HR4013C) has 45% less vibration and 20% more impact energy than the previous model. It is engineered with enhanced Anti-Vibration Technology (AVT®), a synchronized three-component system for significantly less vibration. The result of the enhanced AVT® is a category-leading vibration rating of 5m/s². The powerful 11 AMP motor delivers 8.4 ft. lbs. (11.4 Joules) of impact energy, 20% more than the previous model for faster drilling. An added feature is the option of lock-on or trigger-activated in the “chipping only” mode, with a push button start/stop control for more convenient operation.