Vital component in the propulsion system of a boat or ship, connecting the engine to the propeller and transmitting the power needed to move the vessel through the water, ensuring the vessel’s propulsion system operates efficiently and reliably.

Code	Size (in)	Type
8901001	5	304
8901002	5½	304
8901003	6	304
8901004	6½	304
8901005	7	304
8901006	8	304
8901007	5	316
8901008	5½	316
8901009	6	316
8901010	6½	316
8901011	7	316
8901012	8	316