Makita HR4013C Rotary Hammer, 40mm, Powered by a Powerful 1,100W motor, delivers 500rpm to handle the most demanding applications. This Rotary Hammer features an Anti-Vibration Technology (AVT), which is a synchronized, three-component system that more effectively reduces vibration, and air-actuated counterbalance directs air pressure from the crank and barrel room into the counterbalance cylinders to move counterweight pistons in the opposite direction of the drive piston actively reducing vibration. In addition, the double insulation protects the user, and Variable speed enables the user to match the speed to the application for greater versatility. The torque limiter reduces gear damage, Soft start suppresses start-up reaction for more control and better accuracy, and constant speed to maintain speed under load to complete the most challenging jobs, and the dust collecting system helps provide a cleaner work environment and ensures reliability and long life.