This Kyosho aluminum servo horn is adjustable and fits spline counts of 17-21 and 25T, making it compatible with a range of servo configurations. The anodized red metal construction offers a more durable alternative to standard plastic servo horns. It includes a mounting screw and nylon locking nut for secure installation. Features: Adjustable design fits 17-21T and 25T splines Anodized red aluminum construction Includes mounting screw and locking nut Compatible with Futaba FZD2 servo pattern 7/7/26 cs