STREAMLINE SHAFT ANODE ALUMINUM SHAFT SIZE: 3 1/2" DIA. LENGTH: 4 1/4" OUTSIDE DIA.: 4 3/4" WEIGHT: 3.4 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