Wera Tools - Magnetic socket rail C Impaktor 1 socket set, 1/2" driveSocket rail with 9 Impaktor sockets for use with electric or pneumatic wrenches with 12. 5 mm = 1 2"" drive. The Impaktor technology ensures a higher than average service life even at extreme requirements. The hexagon profile used allows a high power transmission while simultaneously being precise and protecting the profile. With Take it easy tool finder with colour coding by size to help you find the required tool quickly and easily. The rail allows