Tandem steel ball bearing roller assembly for sliding patio door.

Its housing is constructed out of Steel
The wheel itself is center grooved with a diameter of 1-1/2 inch
This design is used by several door manufacturers

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
Top Mount Installation Screw: 10-32
End Mounting Screw: 1/4-20

Contents
1 roller assembly

Related items:
13092 1-1/4 inch Nylon wheel, 11/16 inch Housing
13253 1-1/4 inch Steel wheel, 11/16 inch Housing
13039 1-1/2 inch Steel wheel, 11/16 inch Housing
13339 1-1/2 inch Steel wheel, 11/16 inch Housing - Stainless Steel

Priced and sold each.