Makita 1" AVT Rotary Hammer Drill SDS-PLUS 3-mode w/Handle Hard CaseMakita HR2641 8 Amp 1 in. Corded SDS Plus Concrete Masonry AVT (Anti Vibration Technology) Rotary Hammer Drill with Handle Hard Case The Makita 1" AVT Rotary Hammer (model HR2641, with D Handle) is engineered with Anti Vibration Technology (AVT), an internal counterbalance system for significantly less vibration. The HR2641 combines performance and power with less vibration in a compact size, and is ideal for a range of applications including overhead