These drawer slide roller assemblies are constructed of plastic tires and steel ball bearings. It features a 1/4– 20 mounting stud and the 1-1/8 inch outside diameter tire has a convex edge. This multi-use roller is designed for use as a replacement roller for metal drawer slide systems. Frequently used to repair damaged or missing rollers found in file cabinet drawer tracks. These rollers are easy to install and include to assemblies per package.