Zinc Reliance Shaft Anode manufactured in Canada by Metal Distributors Limited to US military specification A 1800 K. Copper studs on the anode ensure good electrical contact to the prop shaft, giving the best protection to your stern gear. 

Interior copper pads for better connection to the prop shaft

4 fixing bolts

81mm outside diameter

70mm long

1120g

A heavier version of the 1 3/4" is also available

 For use in saltwater