16287-2RS Sealed Ball Bearing 16mm x 28mm x 7mm One Bearing 16287-2RS Sealed Ball Bearing, Bearing inner diameter is 16mm, Bearing outer diameter is 28mm and Bearing width is 7mm, Bearing is made of Chrome Steel, each bearing has 2 Blue Rubber Seals to protect the bearing from dust or any possible contamination, also bearing is pre-lubricated with grease.