16005-2RS Sealed Ball Bearing 25mm x47mm x8mm One Bearing 16005-2RS Sealed Ball Bearing, Bearing is made of Chrome Steel, each bearing has 2 Rubber Seals to protect the bearing from dust or any possible contamination, also bearing is pre-lubricated with grease, the inner diameter is 25mm, outer diameter is 47mm and the width is 8mm.