Attributes . 30MM Bore; 55MM Outside Diameter; 13MM Width; Open Enclosure; ABEC 7 | ISO P4 | ABEC 9 | ISO P2 Precision; Steel Ball Material; 1 (Single) Bearing; 25 Degree Contact Angle; Phenolic Cage Material; 1 Rib Outer Ring Raceway Type; Ball Bearing . Names