Glass Vial With Screw Caps found in: Sample Vials, Screw Thread, Clear KG-33 Borosilicate Glass, with Black Phenolic Cap and Cone-Shaped Polyseal®.. Sample Vials and Accessories - aijiren Technology Corporation 33-expansion glass, the lowest free ion glass available, for Vials are available in three closure types: crimp, snap, and screw cap. 2 mL Holder.