It has a 1/4-inch external hex shank and is intended for use with screwdrivers and drill drivers. The Universal Holder One-Click offers easy bit changes with extra-firm bit hold in universal screw-driving applications. It features a One-Click Function on the chuck that allows one-handed bit changes and further supports the strong bit hold. Furthermore, a permanent magnet ensures a firm and secure grip of the bits in use. The Universal Holder is excellent for all fixing jobs requiring power tools.