1/4"D socket bits x 25mm long: T10, T15, T20, T25, T27 & T30. 3/8"D socket bits x 40mm long: T20, T25, T27, T30, T40, T45, T47, T50 & T55. 1/2"D socket bits x 55mm long: T30, T40, T45, T47, T50, T55, T60 & T70. Manufactured from chrome molybdenum for impact strength with anti-corrosion black phosphate finish. Supplied on a socket rail. Not recommended for use with impact tools.