17mm Ball Attachment for Bike Navigation Compatible with Garmin Yupiteru RWC and Dynojet Power with [REC-Mount 17] Systems (ZUMO), (ATLAS), (X-RIDE),

The first image shows all the included accessories. This product is designed specifically for 17mm ball bearings (it cannot be if the ball bearing is even 1mm different, such as 16mm or 18mm, as the ball bearing will move). Please check the dimensions of your current parts before purchasing. This product (holder attachment) cannot be on its own. Arm parts and joint parts are absolutely necessary. Please be sure to read the product description (this text contains details). If you are using a computer, please click "See More".