Dewalt D25614K 1-3/4 In. Sds Max Combination Rotary Hammer KitDewalt D25614K Features 10. 5 Joules of impact energy for fast drilling and chipping, even in the hardest concrete. E CLUTCH system protects the user in bind up situations by stopping the rotation of the bit. The SHOCKS Active Vibration Control system reduces vibration felt by the user at the handles, compared to rotary hammers without this feature. 7 position, variable speed control for precision hole placement, chipping, and drilling with Atomic