SHAFT LIMITED CLEARANCE COLLAR ANODE ZINC SHAFT SIZE: 1 1/2" DIA. THICKNESS: 1 1/4" OUTSIDE DIA.: 3" WEIGHT: 1.40 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