Makita DHR171RMJ 18v LXT SDS+ Plus Brushless Rotary Hammer 17mm inc 2x BL1840B 4.0Ah Batteries, DC18RC Charger & Makpac Type 3 Carry Case Makita has created a new class in cordless with 18V LXT new compact tools. The Brushless DHR171 17mm SDS Plus Rotary Hammer is ideal for working in tight spaces and for overhead conditions. The DHR171 has an efficient Makita Brushless Motor for up to 50% longer run time, increased power and speed, and longer tool life. It has 2-mode operation for “rotation only” or “hammering with rotation”, with 0-680 RPM, 0-4,800 IPM and 1.2 Joules of impact energy for fast and efficient drilling. The compact size and lower weight mean reduced fatigue for operators, especially for overhead applications. Additional features include a vibration-absorbing handle that moves independently of the motor and hammer mechanism for increased operator comfort, as well as a variable speed trigger, built-in L.E.D. lights, and one-touch sliding chuck for easy bit changes. FEATURES Brushless motor delivers 0-680 RPM, 0-4,800 IPM and 1.2 Joules of impact energy for faster drilling Compact and Ergonomic design at only 273mm overall length Weighs only 2.8 Kg with BL1840B 4.0Ah (included) for reduced operator fatigue Vibration absorbing handle moves independently of the motor and hammer mechanism for increased operator comfort The electronically-controlled Brushless Motor efficiently uses energy to match torque and RPM to the changing demands of the application Efficient Brushless motor is electronically controlled to optimize battery energy use for up to 50% longer run time per charge The Brushless Motor eliminates carbon brushes, enabling the BL Motor to run cooler and more efficiently for longer life 2-Mode operation for \"Rotation Only\" or \"Hammering with Rotation\" for multiple applications Variable speed trigger enables user to match the speed to application for greater versatility Built-in L.E.D. light illuminates the work area One-touch sliding chuck for easy bit changes SPECIFICATION Voltage: 18v Capacity in Concrete: 17 mm Capacity in Steel: 10 mm Capacity in Wood: 13 mm Impact Energy: 1.2 J Shank: SDS+ PLUS  Impacts per Minute: 0 - 4,800 ipm No Load Speed: 0 - 680 rpm Net Weight (inc Battery): 2.8 kg Brushless Motor: Yes NOISE & VIBRATION Noise Sound Pressure: 86 dB(A) Noise Sound Power: 97 dB(A) Noise K Factor: 3 dB(A) Vibration K Factor: 1.5 m/sec² Vibration: Hammer Drilling: 9.0 m/sec² Vibration: Drilling into Metal: 2.5 m/sec²