... (double inner ring or outer rings), cross-rollers, three rows of rollers (double inner rings or double outer rings), etc. according ... machineries, engineering machineries and other fields. Depending on the needs of precision products can be divided into P0, P6, P5 class ... ! As long as customers have item number or drawings or samples of PSL, ROLLEX , SFE will provide you satisfying products and service ...