This Makita HR1840 Rotary Hammer is built for drilling and impact drilling. It features two operation modes: Rotary Hammer and Rotary Only depending on the application. The one-touch sliding chuck makes for easy bit change, increasing productivity. Specifications: Input Power:470W.No Load Speed: 0-2,100/min.Impact Rate: 0-4,800/bpm.Impact Energy:1.4 Joules.Max. Drilling Diameter: Wood24mm,Concrete18mm,Steel13mm.Optimum Drilling Diameter Range in Concrete:4 - 10mm.Power Supply Cord:2.5m.Weight: 2.4kg without cable.