ALUMINUM PROPELLER SHAFT COLLARS

Martyr Aluminum M2 Alloy propeller shaft collar anodes. 
• Protect 50% longer than traditional zinc anode 
• Weigh 50% less than traditional zinc anodes 
• Meets the US Military Specification Mil-A-24779(SH) 
• Is the only anode proven to be effective in salt and brackish water 
• Does not contain Cadmium, a toxic material found in traditional zinc anodes, making it more ecological.