SMR117-2RS Open Stainless Steel Ball Bearing 7mm x 11mm x 3mm SMR117-2RS Open, radial, deep groove ball bearing, bearing is made of Stainless Steel, SMR117-2RS is rubber sealed from both sides to protect the bearing from dust or any possible contamination, also bearing is pre-lubricated with grease, the inner diameter is 7mm, the outer diameter is 11mm and the width is 3mm.