Impact drill series bosch gsb bosch professional power 1 100 watt gear variable speed tool holders 12 inch 20 unf keyless weight 285 kg idle speed max 3 000 rpm blow count max 51 000 countsmin torque max 40 nm drill diameter in concrete 22 mm drill diameter in wood 40 mm special features rightleft rotation auto lock electronic speed control overload protection dimensions 355 x 22 cm power supply mains operation operating voltage 110