The Bosch GDS 18V-LI HT Impact Wrench is extremely robust and tough, due to its all-metal gearbox and metal housing. With variable speed for increased control and precision. Ergonomic design with a soft grip handle for extra comfort and reduced fatique. There's also an LED job light to illuminate the work area. Specification Bit Holder: 1/2in External Square No Load Speed: 0-1,900/min. Impacts Per Min.: 0-2,100/bpm Max. Torque: 650Nm Capacity: M12-M20 Weight: 3.0kg This Bosch GDS 18V-LI HT Impact Wrench is supplied with: 2 x 18V 5.0Ah Li-ion Batteries 1 x Quick Charger 1 x 136 L-BOXX Carry Case