R3ZZ Shielded Ball Bearings 3/16" x 1/2" x 0.196" inch Lot of 10 Bearings R3ZZ Shielded Ball Bearings, the inner diameter is 3/16" inch, outer diameter is 1/2" inch and the width is 0.196" inch, this is a popular size that could be used in many applications, each bearing has 2 metal shields to protect the bearing from dust or any possible contamination, also bearings are pre-lubricated with grease.