Screw Thread Vials are available in 8-425 (8mm), 9-425 (9mm), 10-425 (10mm) and 13.425 (13mm) neck finishes. But the most commonly used is 9mm hplc vial. The technical parameters of a 2ml transparent threaded sample bottle with a scale of 9-425 are as follows: Volume: 2mL. Shape: 12x 32 mm. Color: transparent or amber.