Headspace vial, screw top, rounded bottom (vial only) volume . Headspace vial, screw top, rounded bottom (vial only) volume 10 mL, clear glass vial, thread for 18, O.D. × H 22.5 mm × 46 mm, pkg of 100 ea; find Supelco-SU860099 MSDS, related peer-reviewed papers, technical documents, similar products & more at Sigma-Aldrich.