Nylon ball bearing roller assembly for sliding patio door.

Its wheel is center grooved with a diameter of 1-11/16 inch
Its housing is constructed out of Aluminum and is adjustable
This design is used by door manufacturers such as Western

Housing Tab Style: Unique Housing
Housing Width: 15/16-inch
Roller Diameter: 1-11/16-inch
Roller Edge Type: Concave
Roller Material: Nylon
Roller Width: 7/16-inch

Contents
1 roller assembly

Priced and sold each.