Certainteed 3011907 Tandem roller for vinyl sliding patio glass door. The French Rail roller hardware has a 13/16 aluminum support bracket that slides into top of roller assembly.

Support Bracket: Aluminum U-Channel, 11/16 wide, 13/16 tall, 1-5/8 long
Wheel Diameter: 1-1/2 inch
Wheel Width: 5/16 inch
Wheel Type: Concave
Material: Stainless Steel
Screw Holes: 5-3/4 inch Center to Center
Adjustment: Phillips screw driver.
Clockwise raises the door panel, counterclockwise lowers panel. The roller has a maximum adjustment of a 1/4 inch.
When removing sliding patio door panel, adjust roller to lowest position.

Replacement Option:
This roller can be replaced with 13278 Stainless Steel roller assembly with 1-1/2 inch wheel.
Remove the support bracket and reuse