Ukutywina izikrufu luphawu loyilo oluyilayo oludibanisa izikrufu ze-cylindrical hex kunye nezitywina zobuchwephesha. Isikrufu ngasinye sixhotyiswe ngomsesane wokutywina womgangatho ophezulu, othintela ngokufanelekileyo ukufuma, ukufuma kunye nolunye ulwelo ekungeneni kwikhonkco lokudityaniswa ngexesha lofakelo. Olu yilo olukhethekileyo alunikezeli nje ukuqiniswa okugqwesileyo, kodwa lubonelela ngamanzi athembekileyo kunye nokuxhathisa ukufuma kumalungu.
Uyilo lwe-hexagon lwentloko ye-cylindrical ye-Screws yokutywina inikezela indawo enkulu yokuhambisa i-torque, iqinisekisa uxhulumaniso olunamandla. Ukongeza, ukongezwa kwezitywina zobuchwephesha kubavumela ukuba basebenze ngokuthembekileyo nangokuthembekileyo kwiindawo ezimanzi ezifana nezixhobo zangaphandle, indibano yefenitshala okanye iinxalenye zeemoto. Nokuba ujongene nemvula okanye ukukhanya ngaphandle okanye kwindawo ezimanzi nezinethayo, i-Seal Screws ngokuthembekileyo igcina uqhagamshelo luqinile kwaye lukhuselwe emanzini nokufuma.