5x Round Alloy Aluminum Servo Arm Horn 25T Metal for RC Robot Car Airplane MG945 MG995 MG996 CNC Compatible with Servo motors of Futaba Savox Xcore HL HSP HD,etc. 25 Tooth Spline Diameter of Hub: Outer Approx 10mm; Inner:Approx 6mm The hole approx 11.5mm apart (Center to Center) Diameter of Screw hole:M2.5