1657ZZ Sealed Ball Bearing 1 1/4" x 2 9/16" x 11/16" inch 1657ZZ Bearing is regular section, double Shielded, radial and deep groove ball bearing,1657ZZ bearing is made of Chrome Steel with chrome steel balls and steel cage,bearing is closed with Metal Shields to protect the bearing from dust or any possible contamination,1657ZZ is Shielded and self lubricated, the quality is set to EMQ (electric motor quality) to ensure high speed,1657ZZ bearing is lubricated with grease.