Uwu ndi bwalo la ndege lokhazikika, lomwe limagwiritsidwa ntchito mwapadera kusungirako ndi kunyamula mahema, kotero imatha kuteteza mahema bwino.Ngati muli ndi zida zina, mutha kusinthanso ndegeyo molingana ndi kukula kwa zida.
Ndife fakitale yomwe ili ndi zaka 15, yokhazikika pakupanga zinthu zosinthidwa makonda monga zikwama zodzoladzola, zodzikongoletsera, milandu ya aluminiyamu, maulendo othawa, etc.