Zund blade Z31 e entsoe ka phofo ea tšepe ea tungsten ea boleng bo holimo. Tungsten steel (hard alloy) e na le letoto la thepa e babatsehang e kang ho thatafala ho phahameng, ho hanyetsa ho roala, matla le ho tiea, ho hanyetsa mocheso le ho hanyetsa kutu, haholo-holo boima ba eona bo phahameng le ho hanyetsa ho apara. Carbide e sebelisoa haholo joalo ka lisebelisoa, joalo ka lithulusi tse retelehang, li-milling cutters, lipolane, li-drill, lithulusi tse bora, joalo-joalo, lebelo la ho seha ha li-carbide tse ncha tse entsoeng ka samente hona joale ke makhetlo a makholo a 'maloa ho feta a carbon steel.