The ServoCity 3410 Series Servo-Mount W" Pulley (25T Spline, Dual Spool, 112mm Circumference) is designed for efficient cable-driven assemblies. Its dual-spool configuration allows it to simultaneously wind and release 112mm of string per revolution, making it ideal for power retract lifts and R/C sailboats. The pulley features strategically placed attachment holes for versatile integration into various pulley-based constructions.