R3-2RS Sealed Ball Bearings, the R3-2RS inner diameter is 3/16" inch, R3-2RS outer diameter is 1/2"inch and the R3-2RS width inch is 0.196" inch,R3-2RS is a popular size that could be used in many applications, each R3-2RS bearing are rubber sealed from both sides to protect the bearing from dust or any possible contamination, R3-2RS bearings are pre-lubricated with grease.