9mm screw open top seal with liner. Thread: 9-425 screw open top. Assembled seal with teflon/rubber liner. Ultra-clean type specialized for HPLC/GC MS 2.0 mL, 9 mm Short-Cap, Screw-Thread Vials (vial only) - Restek 21141, Short-Cap Vial, Clear, 12 x 32 mm, 9-425 Screw-Thread, 2.0 mL, 1000-pk. w/White Graduated Marking Spot, Select Deselect