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 & benefits brushless motor one touch sliding chuck for easy bit installation and removal 2-mode operation: rotary only and rotary hammer electric brake variable speed control by trigger constant speed control forward reverse rotation led job light compact and lightweight design vibration absorbing housing specifications battery voltage: 12v battery type: lithium-ion capacity in concrete: 16mm capacity in steel: 10mm capacity in wood: 13mm impact energy: 1.1J impacts per minute: 0-4,800ipm no load speed: 0-680rpm noise k factor: 3db a noise sound power: 97db a noise sound pressure: 86db a optimum drilling range: 4-8mm vibration drilling metal: 2.5M sec vibration hammer drilling: 7.5M sec vibration k factor: 1.5M sec net weight: 1.8-2.4Kg contents hr166d 12v max cxt cordless brushless sds plus rotary hammer drill no batteries no charger no case side handle depth gauge