Flat Roller Assembly for Sliding Windows.

This Roller is constructed out of Aluminum and Steel
It is installed on the vertical rail
The Housing is Aluminum
The Rollers are Steel
The Roller surface is Flat
This design is used by manufacturers such as International

Material: Aluminum and Steel
Roller Diameter: 1/2 inch
Roller Edge Type: Flat
Housing Width: 3/8 inch

Contents
2 Roller assemblies

Priced and sold in pairs.