12" Rubber Bilge Roller. 25mm ID. Suits 22mm spindle.
Flat or Bilge rollers as they are called in some States, go down on the transom of some boats where a flat bottom demands this type of roller.
Certainly not for deep Vee'd boats unless they are part of a spring loaded Retriever Mate type self centering system. Sometimes used as a Bow Stop on Power Cats twin hulled boats.
