1-1/8 in. SDS Variable Speed Pro Rotary Hammer KitBauer anti vibration technology delivers more power to the bit and less to the handle for fast, precise drilling with less user fatigue. Dual controls give you options to hammer, drill or hammer with rotation. Variable control adjusts drill speed for 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 drill to hammer