The Makita HR166D Brushless Rotary Hammer offers 2 modes of operation: rotation only, rotation with hammering. For added control there is a variable speed control trigger, it also offers both forward and reverse rotation. Fitted with a one touch sliding chuck for easy bit installation and removal. Compact and lightweight design with vibration absorbing housing to provide maximum control and comfort. There is also an electric brake for added safety and an LED job light. Features & BenefitsBrushless motorOne touch sliding chuck for easy bit installation and removal2-mode operation: Rotary only and Rotary hammerElectric brakeVariable speed control by triggerConstant speed controlForward / reverse rotationLED job lightCompact and lightweight designVibration absorbing housing SpecificationsBattery Voltage: 12vBattery Type: Lithium-ionCapacity in Concrete: 16mmCapacity in Steel: 10mmCapacity in Wood: 13mmImpact Energy: 1.1JImpacts per Minute