The Nuova Rade 44989 Propeller Washer acts as a fastener for various marine accessories on the boat. The product with a diameter of 5.5 mm, made of white plastic, allows in a simple way to connect surfaces more reliably: when fastening, the support area of fasteners increases. Another useful function of using a seal is to make sure that the screw fits smoothly, perpendicular to the mounting surface.