Camp Donut style shaft zincs are designed to protect drive shafts from corrosion when only limited clearance is available. Zinc Donut Collar contains a copper contact for permanent ground. These zinc anodes provide cathodic protection against corrosion, and therefore should be clamped to an area on the shaft that has clean, unpainted metal.
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How wide is this zinc? I have a 1" diameter prop shaft with a space of 3/4" available between the cutlass bearing and the back of the prop.
They are about 1 inch wide
There is very little space between my prop and the keel. This zinc fits perfectly in the tight space. It was very easy to install - took me two minutes - and it's snug. The spring-loaded copper ball ensures continuous contact with the shaft. Very well made.