Manufactured to US military specification 18001K by Tecnoseal in Italy, one of the worlds leading suppliers of sacrificial anodes for cathodic protection in the leisure boat market. 

Zinc collar Anode, ideal for where space is limited, 2 fixing bolts included

For use in saltwater

Anode for 22mm,  1"  & 1 1/8" diameter shaft             Outside diameter 55mm, thickness 25mm

Anode for 1 1/2" diameter shaft                   Outside diameter 66mm, thickness 25mm