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 59.5lb (27kg) or 81.6lb (37kg), depending on the model. Aluminum rails come in 6′ 67″ (2m) and 9′ 10″ (3m) length. Contains ball bearing set up.