Filayen zaren dunƙulewa da iyakoki suna ba da ƙarancin ƙanƙara, sake amfani da su, ƙarancin rauni na hannu yayin magudi fiye da hatimin ƙira kuma ba buƙatar kayan aiki na musamman. Dukkanin zaren dunƙule vials da iyakoki an bambanta su ta hanyar gama zaren su kamar yadda Cibiyar Marufi ta Glass, GPI ta ayyana. Domin dunƙule zaren vials, an sanya lambar sashi biyu. Alal misali, 8-425 wuyansa gama wakiltar wani vial tare da diamita na 8 mm a fadin waje na zaren da kuma wani thread style na 425. Dunƙule thread vials da iyakoki sun fi tsada fiye da crimp hatimi.