HN11-I101 is the standard idler bearing set for Dynamixel XL 430 series. This idler bearing is connected to the opposite side of the output shaft of Dynamixel X, and can be used to assemble the hinge frame on it. Patented hollow structure enables this set to be assembled with Dynamixels without screws.
Consult the Robotis compatibility table HERE.
How to use it?