Cordless hammer drill number of batteries without batteries series hitachi dh gear variable speed tool holder sds plus weight 22 kg idle speed max 1 500 rpm blow count max 6 200 countsmin drill diameter in concrete 16 mm drill diameter in steel 13 mm drill diameter in wood 18 mm special features electronic speed control rightleft rotation soft handle power supply battery operation charging time 45 min impact force 14 joule included in deliv