????️ AUTOSAMPLER VIALS DIMENSION: These are 8-425 HPLC screw caps lab sample vials. Closure size 8mm, Diameter outer 12mm, Height 32mm, Vial Volume 2ml. Pack of 100. ????️ SEALED DESIGN & REUSABLE: Polypropylene screw cap with precision-fit septa provide an evaporation-proof seal. Bi-layer include silicone and PTFE.