STREAMLINE SHAFT ANODE ZINC SHAFT SIZE: 3 1/4" DIA. LENGTH: 4 1/4" OUTSIDE DIA.: 4 3/4" WEIGHT: 8.5 LBS EASY SIZE VERIFICATION INSIDE AND OUTSIDE EASY INSTALLATION - DEEP SLOTTED S.S. MACHINE SCREWS FOR MAXIUMUM TORQUE INNOVATIVE O-RINGS KEEP SCREWS FROM FALLING OUT