Roller Assembly for Sliding Patio Door
This Roller Assembly has Steel Ball Bearings
Its wheel is center grooved with a diameter of 1-1/2 inch
Its housing is constructed out of Extruded Aluminum and is adjustable
This design is used by several door manufacturers including Pan American, AAA Aluminum
Priced each, sold each

Housing Tab Style: Unique Housing
Housing Width: 7/8-inch
Material: Steel
Roller Diameter: 1-1/2-inch
Roller Edge Type: Concave
Roller Material: Steel
NOTE: There are 4 of these that look the same, Compare measurements:
The one shown is the Pan American
See Additional Images - Click to enlarge.

Helpful Article: How to Replace Rollers in an Aluminum Sliding Glass Door