The struts that connect to the hubs are square 38 mm Aluminium tubes with M10 size holes in them. The M10 holes are designed to take a double spring-loaded spigot which shoots up and down respectively to lock the strut inside the hub.
The struts are colour coded and have Letter identification on them to ensure the correct strut is inserted in the right inlet in the hub. The struts are various sizes and are lettered from A to K. The wall of the aluminium Struts is 3.2 mm wide.
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