A Set of 17 torx bits made from Chrome Vanadium Steel. Includes Chrome Vanadium 1/2" inch adapter. All of the bits share the same 10mm diameter hex base which allows faster bit changes. Each bit has its size imprinted on the bit itself making it easy to identify them after you've removed a handful from the case. And to make tidying up quicker the case displays the bit sizes next to each housing. Specifications: 30mm Length Torx Bits: T20 T25 T27 T30 T40 T45 T50 and T55. 75mm Length Torx Bits: T20 T25 T27 T30 T40 T45 T50 and T55. 1/2" Drive Socket. Blow Moulded Case. Made from Chrome Vanadium Steel.