It is a copy of a double wrench organizer (6x7-8x9-10x11-12x13-14x15-16x17-18x19-20x22mm). I have replaced the original organizer from the combination wrench set with this one from the wrench set. This other organizer takes up less space but on the other hand it does not work well for combination wrenches because they take up more space and are not as flat.
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