Heavy Duty 24T Aluminum Servo Arm - HITEC (Gunmetal)
Length: 19mm (Center to Hole 1), 24mm (Center to Hole 2)
Spline Count: 24
Solid as a rock! Extra lengh arm!This is nearly the exact same as the (non-heavy duty) aluminum servo horn. The only difference is the second clamp screw, and the standard duty horn has an extra linkage mounting hole closer to the pivot point. The color is the main difference. All of them work very well.
The holes at M3. Clamp screws appear to be M2. 1.5mm hex driver to tighten the clamp screws.