Double pitch hardy disc or flex disc. This way you can easily put another pitch cardan shaft or 3-leg flange on your differential or gearbox by changing the hardy disc.
Connection 1: LK105 M12 (Among others 26117605629 26117610061)
Connection 2: LK110 M12 (Among others 26117514207)
Very convenient for changing to another engine, gearbox or diff without having to adjust the length of the drive shaft. The design is aimed at low weight, made of high quality 6082 aluminum, anodized and fitted with rubber bushes for good damping of driveline vibrations and shocks and thus better suited for street use than hard urethane variants.