The LRT10511550 is an IKO Inner Ring in the Inner Rings product series. It is a metric inner ring listed for general usage and designed to assemble with TR11515350.
The supplied product data identifies the following dimensions for the LRT10511550 inner ring:
The listed bearing material is high carbon chrome steel; the product title also refers to high carbon steel.
The product data lists TR11515350 as the assembled bearing reference for this inner ring. The listed mass for the LRT10511550 is 670.0 g. Assembly suitability should be checked against the matching component requirements.