Dewalt Demolition Hammers have German-engineered mechanism that delivers an impact of 19 Joules. The Dewalt D25901K demolition hammer has a non-air pumping beat piece that extends tool and seal life by preventing dust from entering the unit. The Dewalt D25901K has SHOCKS – Active Vibration Control technology to reduce vibration felt by the user. There is a one-step chisel rotation function where the chisel, not tool, can be moved to 12 positions. This demolition hammer has a large on/off switch that can be operated with a single finger, a large rear rubber handle for single- or double-handed operation, and a variable impact control dial with 7 settings. This hammer can be used in both the vertical and horizontal positions.