Yiguo 5pcs 25T M3 Metal RC Servo Arm Horn for Futaba Savox Xcore HL HSP HD Titanium Adjustable type servo arm Hole centers at 20 and 24mm from the servo output 25T spine for Futaba and power HD servos Includes two steel bolts to secure the split-clamp onto the servo output M3 threads for your car or helicopter joints