Dewalt D25892K - 10 Kgs, L Shaped SDS Max Demolition Hammer comes with a shock active vibration control. Dewalt D25892K is used for protecting the user from vibration, including numbness and tingling in the hands & fingers. SDS Max Demolition Hammer comes with a concrete variable speed dial that provides more control over the device. It is done by adjusting the speed of drilling & chipping depending upon the thickness and density of the material that is to be broken.