Use this kit to create coherence between your bar and fork.
This Compression Kit contains a star nut and bolt.
Fits threadless forks and ensures a stable fit with threadless headset.
The star nut is placed inside the bar (on District bars a starnut is placed inside from factory/ you will still need the bolt). Then you mount the bolt bottom-up in the top of the fork with a long allen key.
Also check out this instruction video
Made for District forks, but it is possible to fit other brands as well.
Please note: Does not fit Blunt forks as they require a very long bolt (you can solve this by buying a 300 mm long 6mm threaded rod and a few nuts, and use this together with the District star nut)