It's one of these: http://www.ebay.com/itm/KCNC-KQR-LMB-AL6061-Bike-Bicycle-Cycling-Light-Mounting-Bracket-Black-/141508315844?rmvSB=true
Also here:
https://www.sjscycles.co.uk/lighting-spares/black-kcnc-wheel-skewer-light-mount/?geoc=AU
Cool! Confuses me how that would fit on the inside of the fork though. Does it run super close to the spokes?
@pascalo started
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It's one of these: http://www.ebay.com/itm/KCNC-KQR-LMB-AL6061-Bike-Bicycle-Cycling-Light-Mounting-Bracket-Black-/141508315844?rmvSB=true
Also here:
https://www.sjscycles.co.uk/lighting-spares/black-kcnc-wheel-skewer-light-mount/?geoc=AU