Sometimes you may need Torx keys to perform bike repairs. These keys are provided with six angled star-shaped head that provides a better power transfer. This nine-piece Trivio set contains the most common sizes. The keys are made of hardened quality steel and come with a handy clip that holds them together sorted by size. The set includes the following sizes: T10 / T15 / T20 / T25 / T27 / T30 / T40 / T45 and T50.