Witte screwdriver bits are made to very exacting standards to ensure maximum transmission of torque to the screw by a special hardening process & an exact fit of the bit to phillips screws. In addition there is a special recessed neck called the flex-zone which absorbs shock loads thus giving increased durability. there is also a special coating of titanium nitride which increases their wear resistance.
pack of 25 x 25mm bits with 1/4in hexagon drive.