Impact drill series bosch psb bosch compact expert power 850 watt gear variable speed tool holder keyless weight 25 kg idle speed max 2 800 rpm blow count max 47 600 countsmin torque max 46 nm drill diameter in concrete 18 mm drill diameter in steel 13 mm drill diameter in wood 40 mm special features auto lock speed pre selection rightleft rotation soft handle electronic speed control power supply mains operation operating voltage 230 v