The LRT152020 is an IKO inner ring in the Inner Rings series. It is identified as a metric, general-usage inner ring intended for assembly with TR203320, based on the supplied product data.
The supplied data lists the bearing material as High Carbon Chrome Steel. The title data also refers to high carbon steel. The dimensional details are:
The product data identifies TR 203320 as the assembled bearing reference for this inner ring. It also lists a mass of 21.5 g. Confirm assembly selection against the relevant bearing requirements before ordering.