R2ZZ Shielded Ball Bearings Lot of 10 Bearings R2ZZ Shielded Ball Bearings, the inner diameter is 1/8" Inch, outer diameter is 3/8" Inch and the width is 5/32" Inch, each bearing has 2 metal shields to protect the bearing from dust or any possible contamination, also bearings are pre-lubricated with grease.