SR8-2RS Stainless Steel 1/2" x 1-1/8" x 5/16" Sealed BearingSR8 2RS Stainless Steel Sealed Ball Bearing Bore ID 1 2" x OD 1 1 8" x 5 16" inch wide SR8 2RS Stainless Steel 440C Grade Sealed Ball Bearing, each bearing is rubber sealed from both sides to protect the bearing from dust or any possible contamination, plus its pre lubricated with grease so its ready to roll right away. SR8 2RS Ball Bearing Deep Groove Ball Bearing Size: 1 2" x 1 1 8" x 5 16" inch Bearing Inner Diameter: 1 2" inch Bearing Outer