A small 4" Button Anode from MGDuff which can be used in many areas for your boat. People tend to use zinc because its cheaper but aluminium anodes are a lot lighter and can used in brackish waters.
Bolt-on Disc 0.4 Kgs Nom Net Weight. Sold 1 per pack.
Dia. 100mm x 25mm Hole 14mm
Material: Aluminium for brackish waters
Stud Size: 10mm
Quantity per pack: 1