Priced each, sold each

1-1/8 inch steel ball bearing roller assembly
Adjustable steel housing assembly
Used by many glass door manufacturers
Housing dimensions: thickness, 9/16 inch; length, 2-1/8 inch; height, 1 inch; overall thickness, 25/32 inch.

Diameter: 1-1/8-inch
Housing Tab Style: F-Tab
Housing Width: 9/16-inch
Material: Steel
Roller Diameter: 1-1/8-inch
Roller Edge Type: Concave
Roller Material: Steel
Roller Width: 5/16-inch
Type: Concave
Width: 9/16-inch

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