10 R168ZZ Shielded Bearing 1/4x3/8x1/8 inch MiniatureR168ZZ Ball Bearings 1 4" x 3 8" x 1 8" 10 Bearings 10 R168ZZ Shielded Ball Bearings, the inner diameter is 1 4", outer diameter is 3 8" and the width is 1 8", 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. Item: R168ZZ Double Shielded Ball Bearings Type: Deep groove ball bearings Closures: 2