This is a Bronze Oilite self-lubricating sleeve bearing. Bearings such as these allows for good performance and are maintenance-free since there are no moving parts to the bearing.This sleeve bearing works well with our 8mm Smooth Rod. If you're looking to get your application quieter, they can be a good replacement for LM8UU Linear Bearings.
Diameter: ID8 x OD12 x L15mm