S624-2RS Stainless Steel Ball Bearing 4 x 13 x 5 mm S624-2RS Stainless Steel sealed Ball Bearing, S624-2RS is radial and 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, bearings are sealed and self lubricated, the inner diameter is 4mm, the outer diameter is 13mm and the width is 5mm.