Application: TORX® socket screws. Also suitable for Würth ASSY screws as well as Altenloh SPAX T-STAR plus screws Drive: 1/4" hexagonal, suitable for DIN ISO 1173-D 6.3 bit holders Design:With holding function for TORX® socket screws as per the specification Acument Intellectual Properties. Take it easy tool finder with colour coding by size for easy identification of the required bit.