Bosch 11264EVS 1-5/8 SDS-Max Combination Hammer Combination Hammer Unmatched Power to Weight ratio - 13-Amp, 8.1-Feet lbs Impact Energy and 14.3-Pound - Best Performing Rotary Hammer in its class! Active vibration control - vibration reduction in the hammer mechanism and the grip area provides maximum user comfort for extended periods of work. One-handed SDS max - one-handed tool free SDS max system makes changing bits easier than ever before while maximizing jobsite productivity. Constant response circuitry - maintains speed under load and overload protection. Turbo power - delivers 20-Percent more power in hammer only mode