E le e 'ngoe ea lihanger tsa tlholisano ka ho fetisisa k'hamphaning, li-fasteners tsa rona tsa polasetiki tsa 90 ° tsa ho emisoa li lumelloa ke UPC. Mme ba fumane botumo bo boholo lefats'eng ka bophara, haholo Amerika Leboea. Hape, likhopo tsa bona li lumella phala ho thellisoa habonolo le ka khutso ha phala e hola le ho etsa konteraka ka sebopeho.