SHAFT LIMITED CLEARANCE COLLAR ANODE ZINC SHAFT SIZE: 3/4" DIA. THICKNESS: 1" OUTSIDE DIA.: 2" WEIGHT: .687 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