This is the Robitronic Machined Aluminum Double Sided Stepped Servo Horn, and is intended for use with any servo that uses a 25
tooth spline output shaft. This is not your average run of the mill
aluminum servo-horn. This sturdy and ultra-reliable servo-arm uses a
clamping mechanism that grips the servo’s output shaft with enough force
that you’ll never lose or strip another servo arm again. Even if the
servo horn screw works itself loose, you can keep on racing because the
clamp-style servo horn will still provide a firm grip.