The Aluminum Servo Horn V2 is compatible with the REV Smart Robot Servo and any other servos with a standard 25T spline. Updates from the original Aluminum Servo Horn include additional tapped M3 Holes for more mounting options, 6 M3 Clearance Holes on a 16mm diameter circle to allow additional compatibility with the REV Extended Motion pattern, and a counter-bore center hole to allow the mounting screw to sit below the face of the servo horn. Lightweight but strong, for use under high and low torque applications.