The WS4068 is an inner ring manufactured by IKO for use with thrust roller bearings. It belongs to the IKO Thrust Bearings product series and is supplied in a metric configuration.
The listed dimensions for the WS4068 inner ring are:
The supplied product data identifies the bearing type as Thrust Bearings and lists the bearing material as Carbon Steel. It is categorized under Brand > IKO > Thrust Bearings.