Premium bits for TORX® socket screws. The TORX® HF (HF = holding function) tools developed by Wera stand out with the geometric optimization of the original TORX® profile. The clamping force resulting from the seating stress between the tip and the screw profile keeps the screws securely on the tool! Also suitable for Würth ASSY screws as well as Altenloh SPAX T-STAR plus screws. 1/4" hexagonal, suitable for holding tools as per DIN ISO 1173-F 6.3.