Witte Screwdriver Bits are made to very exacting standards. They ensure maximum transmission of torque to the screw. This is achieved by a special hardening process & by ensuring 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 on the bit which increases their wear resistance. The Bits have 1/4in hexagon drive & are 25 mm. long. Also available in plastic boxes suitable for the consumer. Size. No.2 Point Phillips. Length 25 mm. x 1/4in Hexagon Drive.