Impact drill series bosch gsb bosch professional power 1 300 watt gear variable speed tool holders 12 inch 20 unf keyless weight 29 kg idle speed max 3 000 rpm blow count max 51 000 countsmin torque max 43 nm drill diameter in concrete 22 mm drill diameter in steel 16 mm drill diameter in wood 40 mm special features rightleft rotation auto lock slip clutch power supply mains operation operating voltage 230 v included in delivery key