CAMP AA ANODE PROPELLER ZINC ONLY .75" SHAFT SIZE 1/2-13 THREAD SIZE 1.25" OD Camp Company is a leading manufacturer of marine anodes. Our zinc and aluminum sacrificial anodes are manufactured in the US to ensure the highest quality of corrosion protection. They are manufactured for use on Recreational, Commercial and Military vessels, placed on hulls, propeller shafts, rudders, trim tabs, outboard engines, stern drives, and in the cooling system of most inboard engines to protect metal parts from galvanic corrosion