This is the Tekno RC 25T Aluminum Servo Horn.                                                                                                  FEATURES: 25 tooth spline fits Futaba, Pro-Tek, Savox and Highest brand servos                 Bottom mount design lowers leverage point to reduce damage to the servo spline in the event of a crash                                               M3 locking screw is easier to work with than smaller M2 screws that strip out on other servo horns                                                     Designed specifically for Tekno RC vehicles, but may also be used in many other applications                                                                                                                             INCLUDES: Tekno RC 25T Aluminum Servo Horn with two Linkage Mounting Holes and M3 Screw                                                                                                                                        REQUIRES: TKR1325 M3x14mm flathead screw (TKRC1325) to attach steering linkage Thread locking compound                                                                                                                               SPECS:    Length from Center Hole to Opposite Edge: 0.95" (24.2mm)                                                                                              COMMENTS: The inside (short) mounting hole is strongly recommended for Tekno RC vehicles for smoothest steering response and best servo protection.