Attributes . 55MM Bore; 80MM Outside Diameter; 26MM Width; Open Enclosure; ABEC 7 | ISO P4 | ABEC 9 | ISO P2 Precision; Steel Ball Material; 2 (1 Pair) Bearings; 15 Degree Contact Angle; Phenolic Cage Material; 1 Rib Outer Ring Raceway Type; Ball Bearing . Names