Draper 98962 XP20 20V Brushless 1/2" Impact Wrench 300Nm supplied with 2 x 4Ah Batteries and Fast Charger.
XP20IW1/2.300K

Draper Tools Professional range XP20 20V Brushless Motor 1/2" Impact Wrench with a 300Nm Torque Capacity.
Supplied complete with 2 x 4Ah Batteries, a Fast Charger and a heavy duty carry case.
Expert Quality High performance brushless motor with Intelligent SCB technology and FG reinforced housing
Compact (135mm) body length
Smart reverse (stops impact and slows rotation when bolt/nut is loosened)
3 speed/ torque settings, including smart reverse stop
Super bright LED worklight Variable speed control with electronic brake
Max Torque 300Nm

As with all impact wrenches - To confirm that the fixing is at the correct or required torque, always use a scaleable torque wrench after using an impact wrench for torque accuracy.