ATD Torx Bits are 2 piece construction for strength and made with S-2 Steel. 35 piece 1/4", 3/8" and 1/2" Drive Chrome Vanadium Torx Bit Set. Complete in a Blow Molded Case. 35 Torx Bit Set, 1/4", 3/8" and 1/2" Drive Torx T-8, 10, 15, 20, 25, 27, 30, 40, 45, 50, 55, 60 Tamperproof T-7, 8, 9, 10, 15, 20, 25, 27, 40, 45, 47, 50, 55, Internal - E-4, 5, 6, 7, 8, 10, 12, 14, 16, 18. Blow Molded Case.