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The Du-Bro Tru-Spin Prop Balancer is a general-purpose balancer for model builders and RC aircraft enthusiasts. It is designed to fit props of nearly every size, and is suitable for boat props, spinners, car wheels, helicopter rotor heads, jet fans, fly wheels and more. Du-Bro uses precision machining in the manufacturing process to ensure precise balancing. It features a locking cone on the balancing shaft to secure the prop in place.