10-Pack Sealed Bearings R168-2RS 1/4" x 3/8" x 1/8" MiniatureR168 2RS Sealed Ball Bearings 1 4" x 3 8" x 1 8" inch Lot of 10 Bearings R168 2RS Sealed Ball Bearings, a standard bearing size with dimensions commonly used across many industries: 1 4" x 3 8" x 1 8" inch. Made from high strength chrome steel for durability and performance, each bearing has 2 Rubber Seal to protect the bearing from dust or any possible contamination, additionally, these bearings come pre lubricated with grease for smooth operation.