This bosch set has been designed to provide long run time ultimate durability and is ideal for all round use supplied with 2x40ah batteries charger and carry case to allow easy transportaion and reduced down timebosch gbh 18 v ec professional cordless rotary hammer drillmax impact energy 17 jimpact rate at rated speed 0 ndash 4550 bpm rated speed 0 ndash 1400 rpm bit holder sds plus drilling dia in concrete with hammer drill bits 4 ndash 18 mm opt app range in concrete wit