Cordless combi hammer number of batteries without batteries series makita dhr gear variable speed tool holder sds plus weight 34 kg idle speed max 950 rpm blow count max 4 700 countsmin drill diameter in concrete 24 mm drill diameter in steel 13 mm drill diameter in wood 27 mm special features slip clutch brushless motor speed pre selection power supply battery operation battery voltage 18 v technology li ion charging time 22 min impact fo