2017/11/29 · 2 mL Screw Top Vials & Screw Caps. aijiren 2 mL screw top vials are constructed from from Type 1 borosilicate glass, with low metal content, to protect your sample from destabilizing or leaching. Our 2 mL screw glass vials are available in both amber and clear. The associated 9 mm screw caps and closures come with your choice of septa