This is a top, center mounted, adjustable, tandem roller assembly. The 3/4 in. convex edged nylon rollers are attached to a stamped steel tandem housing mounted on top of a 5/16 in. threaded steel rod. Used on Harvey closet doors 3/4 in. to 1-3/8 in. thick, it threads into a top bracket like the Prime-Line part N 6797.

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