1″ 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 Navalloyaluminum 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″ (25.4mm)B – 2-1/8″ (54mm)C – 2-1/8″ (54mm)