Product Description: Seachoice 95611 Rudder & Trim Tab Anode w/Allen Screw, Magnesium, R4MG, Size 5" dia. x 5/8" Magnesium for fresh water only.
- High-quality, cadmium-free anodes
- Higher protection than zinc
- 2.5 Times lighter than zinc
- Corrodes less than zinc
- Ideal for aluminum hulls
- Installation hardware included