The Duotone Track Nut (4 pieces) is an indispensable spare part for your Duotone kiteboard. These track nuts are used to securely attach your Duotone bindings or footpads to your twintip board. They slide easily into the rails of the board, after which the screws are secured through the bindings and screwed into the nuts. Suitable for all Duotone twintip boards with an insert system.