Compare. Keyword: 'vials hs'. Headspace vial, screw top, rounded bottom (vial only) Headspace vial, screw top, rounded bottom (vial only) Product Number. Product Description. SDS. SU860097. volume 20 mL, clear glass vial, thread for 18, O.D. × H 22.5 mm × 75.5 mm, pkg of 100 ea.