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. 

 Zinc Shaft Anode for 1 1/8 inch prop shafts

2 fixing bolts

55mm outside diameter

52mm long

400g

 For use in saltwater