The BAUER™ 11 Amp SDS-MAX Type Variable Speed Rotary Hammer powers through almost any material. Bauer anti-vibration technology delivers power to the bit and less vibration to the handle for fast, precise drilling with less user fatigue. A built-in safety clutch protects you in case the bit binds with drilling in concrete or masonry. The quick change SDS-MAX type bit system on this rotary hammer holds chisel bits securely.