Screw Top Headspace Vials and Closures - Solid Phase Micro Headspace vial, screw top, rounded bottom (vial only) volume 20 mL, clear glass vial, thread for 18, O.D. × H 22.5 mm × 1.5mL 11mm Snap Ring Autosampler Vial ND11 Material: USP Type 1, Class A