ITEM NAME:25T M3 Aluminum RC Servo Arm Horn for Futaba Savox Xcore Servo HD Blue JR #aucsearchbutton #aucsearchbutton:hover { cursor: pointer;.25T spine for Futaba and power HD servos. Adjustable type servo arm. Hole centers at 20 and 24mm from the servo output. Includes two steel bolts to secure the split-clamp onto the servo output.