This is the fairlead which is used on Laser and ILCA boom for the outhaul as well as on the rear quarter of the deck for the traveller line.
Fairleads are typically positioned to redirect lines in a specific direction, such as changing the angle at which a line is pulled or controlling its path to prevent chafing or snagging.
Made from Acetal. Also available in Blue as well as Aluminium (A.282A).