20% Stronger than One-Piece Torx Bits. This set includes nine of the most popular Torx sizes for automotive applications. The sixsmaller bits are 1/4" drive, and the three larger bits are 3/8" drive. The set includes T-10, T-15, T-20, T-25, T-27, T-30, T-40, T-45 & T-50 in a convenient holder. The T-47, T-55 and T-60 bits are available individually.