The Bosch Core18V 1" Bulldog Rotary Hammer Kit with Two Batteries (GBH18V-26K24) pairs two top of the line Core18V batteries with the 1" SDS Bulldog Rotary Hammer and includes a fast charger to keep you going for longer. It delivers more power in a lighter package than previous iterations. In Bosch's tests, the Bulldog Rotary Hammer with an Core18V battery can deliver up to 32% more holes than previous generation tools with 1.9 foot pounds of impact energy. Built-in KickBack control prevents the tool from spinning in bind up situations which helps to protect the user, the tool, and the material being worked. Electronic Precision Control and Vibration Control also improve user comfort.