6001-8-2RS Sealed Ball Bearing 1/2" Inch x 28mm x 8mm One Bearing 6001-8-2RS Sealed Ball Bearing, Bearing inner diameter is 1/2" Inch, Bearing outer diameter is 28mm and bearing width is 8mm, 6001-8-2RS is made of Chrome Steel, each 6001-8-2RS bearing has 2 Rubber Seals to protect the bearing from dust or any possible contamination, the 6001-8-2RS bearing is pre-lubricated with grease.