GSI captive screws are custom made for sim racers to properly connect quick releases, extension hubs and adapters from threaded to threaded elements. They are made from high grade 12.9 carbon steel black with custom 360 loctite for maximum hold and strength. With a 8mm smooth shaft and a 5mm threaded portion they are specific to most sim racing equipment. Common uses include mounting Fanatec Podium hubs and other threaded QRs to the threaded body of a GSI. They are sold in sets of 6 captive screws and can be used with any sim racing wheel or hub in general.