wiha wisselschacht 1 4Improve your efficiency and make every tightening job easy with the Wiha socket wrench assortment. Like this interchangeable 1 4" blade with a square socket for torque screwdrivers with a standard handle. Ideal for controlled tightening with a fixed torque. Interchangeable shaft 1 4" Square drive for torque screwdrivers with normal handle Ideal for controlled screwdriving with fixed torque