Sold each, priced each

1-1/4 inch steel ball bearing roller unit
Adjustable steel housing assembly
Used by Fleetwood and several glass door manufacturers
Housing dimensions: thickness, 11/16 inch; length, 2-7/16 inch; height, 1-1/8 inch; overall thickness, 3/4 inch.

Diameter: 1-1/4-inch
Housing Tab Style: Plain Back
Housing Width: 11/16-inch
Material: Steel
Roller Diameter: 1-1/4-inch
Roller Edge Type: Concave
Roller Material: Steel
Roller Width: 5/16-inch
Type: Concave
Width: 11/16-inch

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