This is one R8-2RS bearing. This bearing will work with many hubs. It has an OD of 1-1/8" (28.6mm), and ID of 1/2" (12.7mm) and thickness is 5/16" (7.9mm).
This is one bearing; if you need a pair, buy 2!
Be sure to measure your old bearing to ensure this will fit. The appearance of this part may vary slightly from the photo.
