We designed our sliding systems specifically for aluminum frames and aluminum doors, with solutions for office, kitchen, bathroom and other cabinetry . This sturdy system has a maximum load of 59.5 lb (27 kg) or 81.6 lb (37 kg), depending on the model. Aluminum rails come in 6′ 67″ (2 m) and 9′ 10″ (3 m) length. Contains ball bearing set up.