Two flat edge nylon wheels come fixed in an offset adjustable bracket

This bracket easily mounts to the top of your door

Fits a 3/4 In

to 1-3/8 In

thick Harvey or similar styled door

top, center mounted, adjustable, tandem roller assembly

The 1 inch convex or round edged nylon rollers are attached to a stamped steel tandem housing mounted on top of a 5/16 inch threaded steel rod