These extenders affix to the top of an existing servo arm with screws, epoxy, or CA glue, providing a greater range of motion for servos on radio control airplanes, helicopters, cars, and boats.

While individuals are free to make this item using a 3D printer (for non-commercial production), we sell the arms pre-made on Etsy for a very reasonable price. Check us out here: https://www.etsy.com/ca/listing/470828904/set-of-10-assorted-servo-arms