R155 sealed Ceramic Ball Bearing MiniatureR155 PTFE Sealed Ball Bearing 5 32" x 5 16" x 1 8" R155 PTFE Sealed Ball Bearing, this is a popular size that could be used in many applications, the inner diameter is 5 32" inch, outer diameter is 5 16" inch and the width is 1 8" inch, each bearing is sealed with PTFE to protect the bearing from dust or any possible contamination, also bearing is pre lubricated with grease. Item: R155 PTFE Ball Bearing Type: Deep Groove Ball Bearing Seals: PTFE