Lock system for key blade in cross, wherein the key has four wings, which are arranged substantially at right angles relative to each other, and wherein the key channel (6) has portions channel (7-10) corresponding to the wings and one of the channel portions (10) has a width which is greater than the width of the other channel parts (7-9), the wing (5) corresponding to the part of wider channel (10) having a profile and the wider channel portion (10) not having a corresponding profiling or profiling.
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