I have three 30 mm Zinc's designed to fit the Beneteau 30mm shafts. They would not fit on my shaft due to the feathering prop. They are Boat Zinc BD30. I think they cost me about $15.00 each. $25.00 gets all three.
Fletch
Camp David Beneteau Donut Collar Zinc AnodesThese donut collars are specifically designed to fit
the limited clearance on Beneteau propeller shafts.