10mm Screw Thread Cap with Septa--Aijiren Vials for Vials are manufactured in clear type 1 class A or amber type 1 class B borosicate glass. 10-425 screw fasteners and 10mm septum must be used. 2ml Amber Glass Vials on Sale Screw-top vials also come in different sizes, with vial caps made of either aluminum for crimp seals or plastic.