Most respected name in marine anodes- Camp Company
R3 rudder and trim tab anode by Camp Co.
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Size 3-3/4" diameter
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Pancake style, in two pieces
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Weight: 1.61 lbs.
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Locked in place stainless nut
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Allen head stainless bolt
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U.S Mil-Spec
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Brass bushing around bolt hole for electrical contact