Screw Top vials, 12 × 32 mm, limited volume step vial. volume 0.25 mL, amber glass vial, step vial, large opening (with glass insert), pkg of 100 ea. 27422. Snap Ring polypropylene autosampler microvial. volume 0.5 mL, natural polypropylene vial, O.D. × H × I.D. 12 mm × 32 mm × 6 mm, Snap Ring, pkg of 100 ea. 27423.