* Function: It can be connected to electric drills, charging drills or manual wrenches, extending until they are unable to reach.   Narrow space, twisting screws, nuts.   *Features: The quick-release handle is suitable for all electric drills and socket wrenches. The function head is equipped with locking and magnetic devices to ensure that the sleeve will not fall. It can be connected to the standard 1/4 hex bit.   *Material: chrome vanadium alloy steel with magnetic.