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