Mwisi yisi yiziritse, pan head screws ni ibintu byinshi kandi bikoreshwa cyane bitanga urutonde rwibintu, ibyiza, hamwe nibisabwa. Muri iyi ngingo, tuzacukumbura ibisobanuro birambuye byumutwe, dusuzume ibiranga umwihariko wabo, inyungu, ninganda n’imishinga itandukanye aho bakunze gukoreshwa.