1-3\/8" Streamlined Shaft Anode – AluminumAluminum shaft anode with 2 halves and stainless steel hardware.Nuts are pressed into the casting, and bolts are captured with plastic retaining washers for easy assembly.Performance Metals Navalloy® aluminum anodes are manufactured to the military specification MIL-DTL 24779 and are suitable for use in all water types- salt, brackish, or fresh.The anode includes the exclusive, patented “red spot” wear indicator.Dimensions:A – 1-3\/8" (35mm)B – 2-1\/2" (64mm)C – 2-1\/2" (64mm)