Magnesium propeller nut anode manufactured to US military specification A-21412(SH) by Tecnoseal in Italy, one of the worlds leading suppliers of sacrificial anodes for cathodic protection in the leisure boat market. 

Referred to as Beneteau type.

Fixing bolt is not provided.

22-25mm drilled for 6mm bolt

30 to 40mm drilled for 8mm bolt

45mm drilled for 10mm bolt

Diagrams show the sizes of the nut, since the anode is likely to be eroded

For use in freshwater