Sold each, priced each

Tandem steel ball bearing roller
Adjustable steel housing assembly
Fits on Guaranteed Products and many other patio door manufacturers

Diameter: 1-1/8-inch
Housing Tab Style: F-Tab
Housing Width: 11/16-inch
Material: Steel
Roller Diameter: 1-1/8-inch
Roller Edge Type: Concave
Roller Material: Steel
Roller Width: 5/16-inch
Type: Concave
Width: 11/16-inch