Savox 25 Spline Double Sided Aluminum Servo Horn Go to amazon.com Related posts Top 14 recommendation savox servo horn for 2022 FeatureRecommended for high Torque servosLength from center to the outer hole: 38mmRequires Installation on to vehicle DescriptionThis is the Savox aluminum Servo horn, 25 Spline, double sided. Attaches to the shaft of a Servo to fit the device you are operating.