R8-2RSNR Sealed Ball Bearing with Snap Ring 1/2" x 1 1/8" x 5/16" Inch One Bearing R8-2RSNR Sealed Ball Bearing with Snap Ring, Bearing inner diameter is 1/2" Inch, Bearing outer diameter is 1 1/8" Inch and Bearing width is 5/16" Inch, bearing has 2 Rubber Seals to protect the bearing from dust or any possible contamination, also bearing is pre-lubricated with grease.