This mirror door roller assembly is constructed of a steel bracket housing and a convexed (round) edge, plastic wheel. The bracket height (not including the extending roller arm) measures 3-3/16 inch tall x 2 inch wide. This mirror door roller assembly is most commonly used on older Cox sliding mirror door systems. The wheel is constructed of durable plastic which provides for a smooth, long-lasting, quiet roll. This mirror door roller assembly mounts towards the bottoms of sliding mirrored closet doors. It is adjustable once installed, and it is used by a variety of closet door manufacturers.