Izi zimagwiritsidwa ntchito pozizira kuzizira kwa chida cha chida pa zida zamakina, makina ogwiritsira ntchito makina ogwiritsira ntchito, aluminiyam ma podi, etc. chifukwa chojambula, kukwapula, kudula ndi kusanjana kwina. Itha kugwiritsidwanso ntchito malo ang'onoang'ono ozizira opukutira, monga makina okhazikika, foni yam'manja yam'manja. Kuzirala, kuwulutsa mu kupita limodzi, kudalira moyo wa chida ndikuwongolera malizani.
