Screws masu ɗaukar kansu wani nau'in haɗin injin ne na yau da kullun, kuma ƙirarsu ta musamman tana ba da damar haƙowa kai tsaye da zaren zaren kai tsaye akan kayan ƙarfe ko filastik ba tare da buƙatar riga-kafi yayin shigarwa ba. Wannan sabon ƙira yana sauƙaƙa tsarin shigarwa sosai, yana haɓaka aikin aiki, yana rage farashi.
Ana yin sukurori masu ɗaukar kansu da ƙarfe mai ƙarfi, kuma ana bi da saman tare da galvanization, plating chrome, da sauransu, don haɓaka aikin rigakafin lalata da tsawaita rayuwar sabis. Bugu da ƙari, ana iya shafa su bisa ga buƙatu daban-daban, irin su suturar epoxy, don samar da juriya mai girma da juriya na ruwa.