Ball Bearings R4ZZ 1/4" x 5/8" x 0.1960" Lot of 10 Bearings R4ZZ Pack of 10 R4ZZ Ball Bearings, R4ZZ the inner diameter is 1/4", R4ZZ outer diameter is 5/8" and the R4ZZ width is 0.196", R4ZZ is a popular size that could be used in many applications, each R4ZZ bearing has 2 metal shields to protect the bearing from dust or any possible contamination, also R4ZZ bearings are pre-lubricated with grease.