215317-2RS Sealed Bearing 21.5x31x7 Metric215317 2RS Sealed Ball Bearing 21. 5mm x 31mm x 7mm 215317 2RS Sealed Ball Bearing, bearing is made from Chrome Steel with chrome steel balls and steel cage, 215317 2RS bearing is closed with rubber seals to protect the bearing from dust or any possible contamination, bearing is sealed and self lubricated, the quality is set to EMQ (electric motor quality) to ensure high speed, 215317 2RS bearing is lubricated with grease. 215317 2RS Ball Bearing Deep