Big Jon Replacement Clutch Knobs fit shafts found on Big Jon downriggers. The 1/2 inch model fits on Big Jon's manual downriggers, manual planer riggers, and the Brute ES electric downrigger. The 7/16 inch model fits on all Big Jon's electric downriggers and electric planer riggers, Captain's Pak, Pro Tournament, and the Sportsman electric downrigger. Qty. per pack: 2 The Big Jon Replacement Clutch Knobs are made in the U.S.A.