Tandem Roller, 7/8 wheel, 1/2 Offset, Ball Bearing - Back

Part Number: 25421
Price: $11.75
Tandem round edge steel ball bearing roller assembly.

Offset adjustable steel bracket. 
Used on Cox.
Fits 3/4 inch thick doors.

Diameter: 7/8 inch
Offset: 1/2 inch
Roller Edge Type: Convex
Front Back: Back
Mount: Side

Priced and sold in pairs.
This product is similar to or the same as the following part numbers in these brands:
Prime-Line Products: N 7037
SlideCo: 163223-B