Aquaterra Rudder Sheave Set

Best used as replacement sheaves for older classic Aquaterra and Perception rudders (as well as some by Wilderness Systems) outfitted with the central three screw block and pin (white block = Aquaterra and black block =  Wilderness Systems). Sheave set includes four washer like discs, two larger and two smaller. Small disc diameter is 1 15/16 inches. Small disc is 3/16 inches thick. Large disc diameter is 2 5/16 inches. Large disc is 1/8 inches thick. Both have a 1/4 inch center hole.