RMS11 Opened Ball Bearing 1-3/8" x 3-1/2" x 7/8"RMS11 Opened Ball Bearing 1 3 8" X 3 1 2" X 7 8" inch one Bearing RMS11 Opened Ball Bearing, radial and deep groove ball bearing, RMS11 is made from Chrome Steel with chrome steel balls and steel cage, RMS11 bearing is self lubricated, the quality is set to EMQ (electric motor quality) to ensure high speed, RMS11 is lubricated with grease. RMS11 Ball Bearing Deep Groove Radial Ball Bearing Size: 1 3 8"x 3 1 2" x7 8" inch Inner Diameter (ID): 3 1