The LRT172020 is an IKO Inner Ring in the metric sizing system. The listed bearing material is high carbon chrome steel, and the product data identifies it for general usage as an inner ring.
This product is the IKO LRT172020, classified within Inner Rings under the brand path Brand > IKO > Inner Rings.
Review the 17 mm inside diameter, 20 mm outer diameter, 21 mm width, 0.30 mm minimum rs, and da range of 19.0 mm to 19.5 mm against the intended assembly requirements.
The product data lists this inner ring to assemble with NAX 2030 and NBX 2030 bearings. The detail title also identifies compatible assemblies as NAX2030 and NBX2030.
The named assembled bearings are NAX 2030 and NBX 2030. Compatibility should be checked against the relevant bearing arrangement before use.