The Bosch GDR 12 V-EC Professional Cordless Imapct Driver is intended for driving in and loosening screws and bolts as well as for tightening and loosening nuts within the respective range of dimension. Technical data, Battery voltage: 12 V Torque, max: 110 Nm No-load speed (1st level): 0-1,200 rpm No-load speed (2nd level): 0-2,600 rpm Torque settings: 2 Impact rate: 0-3,100 bpm Impact rate (1st level): 0-2,700 bpm Impact rate (2nd level): 0-3,100 bpm Tool holder: 1/4″ internal hexagon