Steering head bearing set complete with bearing cups and bearings for steering column top and bottom.
Steering bearings should be replaced when a yoke is fitted or when you notice play, tightness or knocking on the front end, during normal operation, it will result in a "floating" feel. Often the driver feels nothing of the creeping defect in stock. Only after the change one has to carry the feeling a completely new vehicle.
Grease before mounting the bearings!