Chingwe cholumikizira ichi chapangidwa kuti chikhale ndi mphamvu zatsopano - matabwa oteteza mabatire. Imatsimikizira kulumikizidwa kwamagetsi kokhazikika, imakhala ndi zotchingira zapamwamba kwambiri, ndipo ndiyofunikira kuti batire igwire bwino ntchito motetezeka komanso moyenera.