SMR148-2RS Stainless Steel Ceramic Ball Bearing Quality: ABEC-5 8mm x 14mm x 4mm SMR148-2RS is radial, deep groove ball bearing, bearing is made of Stainless Steel, Quality is ABEC-5, SMR148-2RS 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 8mm, the outer diameter is 14mm and the width is 4mm.