Kaha ke e 'ngoe ea lihanger tse tlholisano ka ho fetisisa k'hamphaning, li-hanger tsa rona tsa koporo tse tlotsitsoeng ka khanya li fumane botumo bo boholo ho phatlalla le lefats'e, haholo Amerika Leboea. Hape, li ka fetoloa ho latela litlhoko tsa hau, mohlala, li ka etsoa ka rabara, kenyelletso kapa thebe. Mme ho na le kalafo tse fapaneng tsa bokaholimo bakeng sa khetho ea hau: Pele ho galvanized, Zinc tlotsitsoe, epoxy le Green galvanized fihlela qetellong ho fihlela litlhoko tsa hau tse fapaneng tsa anticorrosion.