Ama-screw thread vials namakepisi ahlinzeka ngokuhwamuka okuphansi, ukusebenziseka kabusha, ukulimala okuncane kwesandla ngesikhathi sokukhohlisa kune-crimp seal futhi awadingi amathuluzi akhethekile. Wonke ama-screw vials namakepisi ahlukaniswa ngokuqedwa kwawo njengoba kuchazwe yi-Glass Packaging Institute, GPI. Kumabhodlela entambo yesikulufu, inombolo yezingxenye ezimbili inikezwa. Isibonelo, ukuqedwa kwentamo engu-8-425 kumele i-vial enobubanzi obungu-8 mm ngaphesheya kwemicu kanye nesitayela sentambo engu-425. Izigqoko ze-screw thread kanye namakepisi zibiza kakhulu kune-crimp seal.