20 Ml Screw Clear Glass Storage Vials With 24-400 Screw Closures. 2ML, Screw thread, Amber Glass, Flat base, Storage Vial, 12x32mm,100pcs/pk. Borosilicate Glass. 4ML-13-V1001, 4ML, Manufacturer of Closures used to Seal Chromatography Vials. Jan 8, 2021 TAGS: autosampler-vial-cap hplc-vial-caps pp-cap crimp-cap screw-cap snap-cap. Polypropylene