Cordless hammer drill number of batteries with 1 battery series bosch gbh bosch professional power 300 watt gear 1 speed tool holder sds plus weight 26 kg idle speed max 1 400 rpm blow count max 4 550 countsmin drill diameter in concrete 18 mm drill diameter in steel 13 mm drill diameter in wood 30 mm special features rightleft rotation brushless motor speed pre selection dimensions 285 x 218 cm power supply battery operation battery volt