Center grooved steel ball bearing roller assembly for sliding patio door.

Adjustable die-cast housing.
This design is used by several door manufacturers including Trimview.

Housing Tab Style: Unique Housing
Housing Width: 11/16 inchRoller
Diameter: 1-1/2 inch
Roller Edge Type: Concave
Roller Material: Steel
Roller Width: 5/16 inch

Priced and sold each.