The WS70105 is an IKO inner ring designed for use with a thrust roller bearing. It is listed in the IKO Thrust Bearings product series and is described as a metric inner ring.
The order number for this part is WS70105, and it is categorized under Brand > IKO > Thrust Bearings. The supplied product data identifies the bearing material as carbon steel and the bearing type as Thrust Bearings.