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1-1/2 inch steel ball bearing roller unit
Adjustable steel housing assembly
Used by several glass door manufacturers
Housing dimensions: thickness; Adjustable from 11/16 to 13/16 inch; length, 2-3/8 inch; height, 1-1/2 inch; overall thickness, 13/16 inch.

Sold each, priced each
Diameter: 1-1/2-inch
Housing Tab Style: Plain Back
Housing Width: 11/16-inch
Material: Steel
Roller Diameter: 1-1/2-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