All PerkinElmer headspace vials are manufactured to Headspace Vials, Beveled Top, Flat bottom - Headspace vial, clear glass, beveled top, flat bottom volume 6 mL, O.D. × L × I.D. 22 mm × 38 mm × 12.5 mm, for use with PerkinElmer ®, pkg of 100 ea 6 mL thread for 20 mm clear glass vial Vial, 6mL, RB, 20mm Headspace, Round Bottom,