Cordless hammer drill series bosch gbh bosch professional gear 1 speed tool holder sds plus weight 19 kg idle speed max 1 050 rpm blow count max 4 950 countsmin drill diameter in concrete 12 mm drill diameter in steel 8 mm drill diameter in wood 16 mm special features rightleft rotation speed pre selection dimensions 278 x 202 cm power supply battery operation battery capacity 15 ah charging time 30 min impact force 1 joule included in