Standard Opening glass gas chromatography vials with high quality Waters 2 mL Standard Opening Vials, 12 x 32 mm - Convenience Kits Vials, open-top screw cap, 2 mL standard opening with closures, convenience pack, unasseled clear glass vial, PTFE/silicone/PTFE, O.D. × H × I.D. 12 mm × 32 mm × 4.6 mm, pkg of × 100 ea 2