1" Streamlined Shaft Anode - Aluminum Aluminum 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" (25.4mm) * B - 2-1/8" (54mm) * C - 2-1/8" (54mm)