Tandem wheels, top mounting, adjustable bracket, round edge plastic wheel. Fits 3/4" to 1-3/4" thick doors. For doors weighing up to 75 pounds. Used on Acme and Stanley door systems 2 Pack Twin wheel Pocket door roller Top mounting Adjustable bracket Round edge nylon wheel Fits 3/4" to 1-3/4" thick doors Fits Acme and