Bauer anti-vibration technology delivers more power to the bit and less to the handle for fast, precise drilling with less user fatigue. The Quick-Change chuck lets you swap out bits in a hurry while dual controls give you options to hammer, drill or hammer with rotation. Variable speed lets you work in a variety of materials. The quick change SDS-type bit system on this rotary hammer holds chisel bits securely. 10 amp motor ensures powerful performance Easily switch from hammer dill to hammer only Dual position switch from hammer drill to precision drill Impact rate of 3900 BPM with 3.7 ft. lbs. impact energy for pounding through the toughest concrete and masonry Variable speed control dial matches speed to application Accepts industry standard SDS bits Adjustable 360° side handle for maximum comfort and control Shock absorbant anti-vibration handle prevents strain and fatigue High power-to-weight ratio