Full range of sockets fit special fasteners with 5-point heads and tamper-proof design. 2 pc. Bit and Socket assembly offers the highest torque specifications. Manufactured with Chrome-Vanadium steel socket holders and heat-treated S2 steel bits, all packed on socket rail. 1/4" Drive Sizes include: T8, T10, T15, T20, T25, T27 & T30 3/8" Drive Sizes include: T40, T45, T50 & T55. All bits available separately.