Oct 23, 2021 · Screw Thread Vials are available in 8-425 (8mm), 9-425 (9mm), 10-425 (10mm) and 13.425 (13mm) neck finishes. Crimp-Top Vials Crimp-top vials are a cost-effective solution using aluminum crimp seals. When properly crimped, this vial-cap combination provides the best seal for long term sample storage and volatile solvents. Snap-cap Vials