Makita 28mm SDS Plus Rotary Hammer - HR2811FT – Features 3 mode operation: Rotation only, Rotation and Hammering, Hammering. Only 15m/s² thanks to AVT (Anti-Vibration Technology) with an 800W motor providing 2.9j of hitting energy. Benefit of a quick-change chuck from SDS Plus to drill chuck. Torque limiter protects tool and operator if the bit should jam.