Hammer drill series bosch gbh bosch professional power 880 watt gear 1 speed tool holder sds plus weight 31 kg idle speed max 900 rpm blow count max 4 000 countsmin drill diameter in concrete 28 mm drill diameter in steel 13 mm drill diameter in wood 30 mm special features speed pre selection rightleft rotation rotation stop overload protection stepless speed control anti vibration dimensions 402 x 216 cm power supply mains operation impa