6406-2RS Sealed Ball Bearing 30mm x 90mm x 23mm One Bearing 6406-2RS Sealed Ball Bearing, the inner diameter is 30mm, the outer diameter is 90mm and the width is 23mm, 6406-2RS is a popular size that could be used in many applications, 6406-2RS Bearing is made of Chrome Steel,bearing has 2 Rubber Seals to protect the bearing from dust or any possible contamination,6406-2RS bearing is pre-lubricated with grease.