Tandem steel ball bearing roller patio door roller
Adjustable steel housing assembly for glass doors
Used by many Sliding door companies including Columbia on their 2500 Series Thermal Break Door, Atrium 311 / 312 Glass door, Alside 6108 Vinyl door, Acorn Doors and others.
Used by Alside on their # 6108 Vinyl Door (to remove door panel from opening, it has to be taken apart)

Adjustable steel housing.
Housing Tab Style: Plain Back
Housing Width: 3/4 inch
Housing Height: 1 inch
Roller Diameter: 1-1/8-inch
Roller Edge Type: Concave
Roller Material: Steel
Roller Width: 5/16-inch
Housing Screw: 10-24 Thread ( some are 1/4-20 )

Note: Similar to 13266.

Priced and sold each.