Xaraashka vial waa qalab shaybaar loogu talagalay in lagu qabto loona abaabulo vials ama tuubooyin. Vials waa weelal yaryar oo loo adeegsado cilmi-baarista sayniska, baaritaanka, iyo codsiyada kale ee lagu keydiyo oo lagu qaado cabitaannada, budada, ama samballada kale. Racks vial-ka ayaa sida caadiga ah laga sameeyaa bac, bir, ama isku darka labada qalab oo ay ku yimaadaan cabbirro kala duwan iyo qaabeynta si loo habeeyo noocyo kala duwan oo vials ah.