The Makita HR4013C 40mm AVT SDS Max Rotary Hammer has been developed to provide higher operating efficiency and more comfort with an unrivalled low level of vibration. It has a one touch sliding chuck for easy bit installation and removal and an easy to operate operation-mode change lever. This is located on the top of the motor housing for reduced possibility of breakage.The soft no load function automatically reduces the motor speed during idling to suppress the vibration of the machine body. There is a handy LED service light indicating when to replace carbon brush, preventing additional damage to the gearings.The vibration absorbing housing offers unrivalled low level of vibration. In hammering mode, the on/off switch is switchable between two switches to meet your application, for Continuous or Intermittent chiselling applications. Specifications: Input Power: 1,000W.No Load Speed: 250-500/min.Impact Rate: 1,450-2,900/bpm.Impact Energy: 8.0 joules.Max in Concrete: 40mm.Weight: 6.8kg. Vibration K factor1.5 m/sec².Vibration: Chiselling4.5 m/sec².Vibration: Hammer Drilling: 5 m/sec².