Aluminum Ball Connector with Locking Sleeve.Heavy duty aluminum ball connector for throttle connections and internal servo arms. These ball joints are made of machined aluminum and provide a full range of motion, permitting off-axis operation. Unique spring loaded, aluminum sleeve holds hardened steel ball firmly in place yet easily released for changes and final adjustment.Available in four sizes:4-40 in blue - #385912-56 in red - #385902mm in green - #385923mm in gold - #38593