The Impaxxo 18/400 cordless ½” square drive impact wrench – Bare Unit – is a part of the Einhell Power X-Change range, meaning that it is compatible with the PXC interchangeable battery system. Perfect for removing tough and stubborn nuts effortlessly. Also good for large and long bolt installations, or for jobs with lots of repetitive installations. Bare Unit – Use with your existing Einhell Power X-Change batteries and charger. Click to see the whole Einhell Power X-Change range.