This is replacement ProTek R/C Aluminum Clamping Servo Horn, intended for use with ProTek R/C servos. This extremely tough servo-horn has been machined from a solid block of aluminum for incredible precision, rigidity and durability. The horn features a clamp type design that grips the servo’s output shaft so if the retainer screw comes loose, the horn will have a better chance of remaining in place, increasing your chances of finishing the race! Plus, the horn has a 3.5mm thick arm for durability, with 16.5mm and 20mm hole spacing threaded for 3mm hardware to suit the geometry and hardware requirements of most vehicles. 

Features:

• Clamp design
• 16.5mm and 20mm hole spacing (measured from output shaft screw hole, to linkage rod holes, center to center)
• 3.5mm thick arm
• 31mm Overall length
• Linkage holes threaded for 3mm hardware
• 25T Spline ProTek Output Sha