Shackle ndiye chida cholumikizira chomwe chimagwiritsidwa ntchito kwambiri pakukweza ntchito. Amagwiritsidwa ntchito kwambiri pazolumikizana zomwe nthawi zambiri zimayikidwa ndikuchotsedwa pakukweza. Pamene chingwecho chikugwiritsidwa ntchito pamodzi ndi mtengo, chingwecho chingagwiritsidwe ntchito pamwamba pazitsulo m'malo mwa mphete yokweza ndi mbale pansi pa mtengo. Kulumikizana kwa kukhazikitsa kosavuta ndikuchotsa. Ma shackles amagwiritsidwa ntchito kwambiri mumagetsi, mafuta, makina, mphamvu yamphepo, mafakitale amankhwala, madoko, zomangamanga ndi mafakitale ena, ndipo ndizofunikira kwambiri zolumikizirana pakukweza.