Sockets manufactured in Chrome Vanadium and bits in S2 steel (except M14 - M16 which are CV6150).Contents: 8 x 55mm long: M5, M6, M8, M9, M10, M12, M14, M16.7 x 100mm long: M5, M6, M8, M9, M10, M12, M more→14.7 x 140mm long: M5, M6, M8, M9, M10, M12, M14.4 x 200mm long: M8, M10, M12, M14.