11 Piece Ball Torx Bit Set Features and BenefitsS2 steel, the strongest and hardest bits availableSet includes 2 magnetic bit driversHandy carrying caseBall torx for limited access areas11 piece set includes sizes: T10, T15, T20, T25, T27, T30, T40, T45, T50 and 1/4" square drive bit holder and 1/4" hex magnetic bit driver.