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- Direct 3.175 mm motor shaft to 4 mm propeller shaft coupling; Compatible with RC boat drive lines for smoother power transfer during runs and bench testing. - Aluminum alloy hubs with rubber insert absorb minor misalignment, damp vibration, and help reduce drivetrain noise. - Compact 24x10 mm body fits tight hull spaces and supports brushed or brushless motors. - Simple setup: align shafts and verify clearance; reduces need for extra adapters for workshop builds, club repairs, and on-site tuning. - Intended for RC model boats on ponds or pools; also useful for small robotics and DIY motion projects needing a compact, flexible link between different shaft diameters.