Dynamite Alum Throttle Servo Arm 15T Spline: Losi MTXL Perfect fit every time  CNC Machined for consistent and accurate tolerances High Strength  Made with 7075 T6 Aluminum Secure connection with less flex than stock molded arm Great looks  Black anodized aluminum Fits 15T spline servos (Spektum, Hitec etc.). *Does not fit stock/OEM DBXL servos.