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

90mm outside diameter

85mm long

1700g

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

 For use in saltwater