Description For 90027F & 90025F Flared Galvalume collar to prevent chain wear or chaffing. One piece, weld-free construction and corrosion resistance you can rely on to last and last. Fits 1 7/8 dia. (2 nominal) collar/spindle openings. Galvalume steel alloy has 10X the corrosion resistance of hot-dipped galvanized steel.