This is a mid size servo saver from Kimbrough Products. This servo saver comes with a small
tree with three different splines on it for adapting the servo saver to
work with KO, Airtronics, JR, Futaba, Thunder Tiger and Hitec servos.
Kimbrough makes some of the best servo horns in the business, and their
servo savers are second to none! If you have a high stress application
where you do not have an existing servo saver, you can use this servo
saver to help save the gear of the servo during hard crashes.