Don kiyaye manyan lodi a wurin ƙarfe da aikin gini, kuna buƙatar ɗaure mai ƙarfi, aminci, da arha. PET madaurin, wanda aka yi daga Polyethylene Terephthalate, ya zama amsar zamani kuma ana amfani dashi a yanzu maimakon karafa a cikin ɗakunan ajiya, yadudduka na masana'antu, da cibiyoyin rarraba duka.