The BF-0393R is a precision 40mm propeller engineered for boat applications, featuring an M4 shaft connection for secure, reliable mounting. This compact propeller delivers efficient thrust in smaller watercraft, offering smooth operation and dependable performance. The 40mm diameter provides optimal balance between responsiveness and power delivery, making it ideal for model boats and lightweight vessels. Built to exacting specifications, it ensures consistent hydrodynamic performance and durability in freshwater and saltwater environments. The M4 threading guarantees compatibility with standard shaft systems, simplifying installation and maintenance.