Just choose front or back; 12mm of 15mm. That's it, that's the dream.
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N.B. This is a standalone skewer.  To fasten requires a 6mm allen key, to secure requires the 6mm HexLox Magnet Insert, to release requires the corresponding HexKey (magnet inserts and keys need to be bought from the same "batch", call us if you have questions on how this system works)