Headspace ND20 vials with crimp neck manufactured from 1st hydrolytic class borosilicate glass in both flat bottom and round bottom style. 6-20mL 20mm Crimp-Top Headspace ND20--Aijiren Hplc Vials Material: USP Type 1, Class A, 33 Borosilicate Glass Dimensions: 22 x 38mm/22.5 x 46mm/22.5 x 75mm Application: GC system Neck Diameter: 20mm Qty/Pack: