THULE PRO Thule Fork-Down Type Cycle Carrier Attachment, T-slot Compatible Product Details This is a THULE PRO fork-down type cycle carrier attachment. It is a type that removes the front wheel and clamps the front fork. Installation is T-slot compatible. I used to attach it to a square bar with grooves. I am not sure if it can be installed on recent aero-type bars, so please check by the winning bidder. The fork fixing part supports road bikes with a front axle diameter of 9mm and an axle width of 100mm, the so-called quick-release type rim brake type. One key is included. When listing, I applied a gloss-enhancing protective agent to the resin parts. The resin will inevitably become whitish as it is used, so I think the black gloss will be maintained for the time being. The items in the photos are all that is included. The items necessary for attaching to a square T-slot bar are included. It seems that it is possible to attach it to an old-fashioned square bar by purchasing separate small parts from Thule. If you are interested, please check and purchase.