This is a bottom mount roller assembly for mirrored wardrobe doors. Used by Marshall Doors, the door rests on a tab on the bottom edge of the roller housing while being held in place by installation screws from the side and into installation holes on the roller's back sides. The adjusting screw can be accessed through a hole below. The 1-1/2 in. concave nylon ball bearing roller allows the metal framed mirrored door to roll smoothly and effortlessly.