Themutuwa-simintin gyare-gyaremold ya ƙunshi sassa biyu, ɓangaren murfin da ɓangaren motsi, kuma ɓangaren da aka haɗa ana kiran shi layin raba. A cikin ɗaki mai zafi mutu simintin, ɓangaren murfin yana da ƙofar, kuma a cikin ɗakin sanyi mutu simintin, tashar allura ce. Karfe na narkar da zai iya shiga cikin kwandon daga nan, kuma siffar wannan bangare ya dace da dakin allura a cikin dakin zafi mutu simintin ko kuma dakin allurar da ke cikin dakin sanyi mutu simintin.