This mirror door roller assembly is constructed of a steel housing and a concaved (grooved) edge, plastic wheel. The housing has 2-1/2 in. mounting hole centers, its body measures 1-11/16 in. wide and its only 7/16 in. deep. This mirror door roller assembly is most commonly used on wood framed sliding mirror doors. The wheel is constructed of durable plastic which provides for a smooth, long-lasting, quiet roll and it features a narrow concave (grooved) edge. This mirror door roller assembly mounts on the bottoms of sliding mirrored closet doors, it is adjustable once installed, and it is used by many closet door manufacturers.