SHAFT LIMITED CLEARANCE COLLAR ANODE ALUMINUM SHAFT SIZE: 7/8" DIA. THICKNESS: 1" OUTSIDE DIA.: 2" WEIGHT: .63 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