20mm closure clear volume 20 mL gc vial-Crimp Vial Supplier 20 mL clear glass screw top vials manufactured by LaPhaPack in Germany and are designed for headspace analysis with CTC and LEAP Combi Pal or Gerstel MPS2 instruments. 100 vials per pack. 20ml Precision Thread Vial ND18 (clear) 75.5 x 22.5mm, pack of 100 – Rounded Bottom . 1st Class Hydrolytic borosilicate glass.