The Du-Bro DUB518 Pull-Pull System is a 4-40 threaded cable-based control linkage system for RC aircraft rudder and other control surface applications. The pull-pull design eliminates pushrod flex for precise, responsive control surface movement on larger RC aircraft. Includes cable, 4-40 threaded connectors, and hardware for a complete installation. Key Features 4-40 threaded pull-pull cable control system for RC aircraft Eliminates pushrod flex for precise, responsive control surface movement Includes cable, 4-40 threaded connectors, and mounting hardware Ideal for rudder and other control surface pull-pull applications on larger RC aircraft Durable construction for long service life Compatibility Compatible with 4-40 threaded RC aircraft control linkage hardware Suitable for glow, gas, and electric RC aircraft rudder and control surface linkages Specifications SKU DUB518 Thread Size 4-40 Type Pull-Pull Cable Control System Application RC aircraft rudder and control surface linkage