The Capri Tools Torx Key Wrench Set is constructed of premium S2 steel, a steel used only for premium hand tools for its shock-resistant and tough properties, outperforming Chrome Vanadium and lesser alloy steels, and therefore our hex key wrenches maintain their shape with heavy use. Chamfered edges enables easy insertion onto fasteners. Our flexible single piece storage case opens flat so you can easily access your wrenches, and it folds and latches securely for easy carry and storage. The wrenches are finished with corrosion resistant smooth black oxide. 9 Torx Sizes: T10, T15, T20, T25, T27, T30, T40, T45, T50