Tandem closet door roller.
Top mount hanger for pocket doors.
7/8 inch round edge nylon wheel.
For 1-3/8 inch thick doors up to 75 pounds each.
Roller Diameter: 7/8-inch
Roller Edge Type: Convex
Priced and sold each.
This product is similar to or the same as the following part numbers in these brands:
Prime-Line Products: N 6530