Makita HR5212C SDS-Max Rotary Hammer 52mm 20JIt's what's INSIDE that counts. HR5212C 52mm (2 1 16) 20 J Rotary Hammer, SDS MAX Shank 1,510W Powerful 1,510 W motor delivers 20 J of impact energy to handle the most demanding applications Anti Vibration Technology (AVT) is a synchronized, three component system that more effectively reduces vibration resulting in a low 9 m s Air actuated counterbalance directs air pressure from the crank and barrel room into the counterbalance cylinders to move