Introduction. These 2ml HPLC vials closures size 9mm, Diameter outer 11.6mm, Height 32mm, Vial Volume 2ml. Pack of 100. The most commonly used vials are 9mm, 12x32mm screw thread vials. A 12x32mm vial is also known as 1.5mL, 1.8mL, and 2.0mL vials. V913.