The LRT12013545 is an IKO Inner Rings series metric inner ring. It is listed for assembly with an RNA4924 bearing and is identified under the category path Brand > IKO > Inner Rings.
The supplied product data lists the inner ring with a 120 mm shaft/inside diameter, 135 mm outer diameter, and 45 mm width. The listed bearing material is high carbon chrome steel; the title introduction also refers to high carbon steel.
The product data identifies RNA 4924 as the assembled bearing. Use the listed dimensions and compatibility information to compare the part with the required inner ring before selection or installation.