This is a replacement D-Wheel Style servo horn ...
from Futaba. This servo horn replaces damaged or missing servo horns used on a variety of Futaba servos including the S28, S48, S148, and S3003 (standard output spline) servos. This servo horn ...
Standard Servo Arms for Hitec servos. Designed for use in aircraft, car, boat, and helicopter models. Unlike conventional servo arms, they are made of long fiber composites for added strength. Longer versions ...