R2-5ZZ Miniature Shielded Bearing 1/8" x 5/16" x 9/64"R2 5ZZ Shielded Ball Bearing 1 8" x 5 16" x 9 64" R2 5ZZ Shielded Ball Bearing, a standard bearing size commonly used in a variety of industrial and commercial applications, Made from high strength chrome steel for durability and performance, each bearing has 2 Metal Sheild to protect the bearing from dust or any possible contamination, plus its pre lubricated with grease so its ready to roll right away. R2 5 ZZ Ball Bearing Deep Groove Ball Bearing