SMR83-2RS Stainless Steel Ball Bearing 3mm x 8mm x 3mm SMR83-2RS double sealed radial deep groove ball bearing, bearing is made of Stainless Steel, bearing is closed with rubber seals to protect the bearing from dust or any possible contamination, bearing is sealed and self lubricated, the inner diameter is 3mm, the outer diameter is 8mm and the width is 3mm.