Vials, screw top, R.A.M.™ (9 mm thread), large opening, 12 x 32 Vials, screw top, R.A.M. (9 mm thread), large opening, 12 x 32 mm volume 2 mL, amber glass vial (with graduated marking spot), pkg of × 1000 ea; find Supelco-29011U MSDS, related peer-reviewed papers, technical documents, similar products & more at Chrominex screw top headspace gas chromatography with high quality-Headspace