The LRTZ324021 is an IKO inner ring in the Inner Rings product series. It is listed under the category path Brand > IKO > Inner Rings and is identified for metric, general usage.
The supplied product data identifies the bearing material as high carbon chrome steel, also described in the title information as high carbon steel. The inner ring is referenced for assembly with RNA49/32UU, with the supplied data listing the assembled bearing as RNA 49/32UU.