This tandem wheel roller assembly features a pair of steel wheels housed in an adjustable steel frame. Each wheel has a concaved (center-grooved) edge, a steel inner race, steel ball bearings, and a 5/16-inch roller width. The outside diameter of the rollers is 1-1/4 inches. This assembly is designed to replace damaged patio Yard roller assemblies in sliding glass Yards and is compatible with a variety of patio Yard manufacturers.