Spline bits x 30mm long: M4, M5, M6, M8, M9, M10, M12, M14. Manufactured from impact quality S2 steel. Spline bits x 30mm long: M16, M18. Manufactured from chrome vanadium. Spline bits x 75mm long: M5, M6, M8, M9, M10,M12, M14. Manufactured from impact quality S2 steel. Spline bits x 75mm long: M16, M18. Manufactured from chrome vanadium. 2 x 10mm long bit adaptors: 1/2"D, 3/8"D.