Screw glass vial imatanthauza mtundu wa chidebe chopangidwa ndi galasi chomwe chili ndi kapu kapena makina otseka. Mbalezi zimagwiritsidwa ntchito posungira ndi kunyamula zinthu zosiyanasiyana, monga zamadzimadzi, ufa, kapena zitsanzo zazing'ono zolimba, mu sayansi, mankhwala, ndi mafakitale.
Chophimba chotchinga chimatsimikizira chisindikizo chotetezedwa komanso chopanda mpweya, kuteteza zomwe zili mu vial kuti zisatayike kapena kuipitsidwa. Izi ndizofunikira makamaka posunga zinthu zodziwikiratu kapena zofunikira zomwe zimafunikira kutetezedwa ku chinyezi, mpweya, kapena zinthu zina zakunja.