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: Wood 24mm, Concrete 18mm, Steel 13mm. Optimum Drilling Diameter Range in Concrete: 4 - 10mm. Power Supply Cord: 2.5m. Weight: 2.4kg without cable.