The unique professional feature of Titan's auto-flex spring loaded designed products make coupling with slightly off-angle fasteners much easier to attain. The auto flex design allows for one-handed operation in some cases. Auto-Flex™ products articulate under spring tension providing semi-rigid directional control and accuracy, The spring back design eliminates the cumbersome "flop" found when using traditional universal joint tools. Auto-Flex products are constructed of durable chrome-vanadium alloy steel for exceptional strength and longevity.