Common use 20ml screw gc glass vials for lab test VWR-Aijiren Home » News » 20ml screw headpace vials » Common use 20ml screw gc glass vials for lab test VWR Common use 20ml screw gc glass vials for lab test VWR Material: USP Type 1, Class A, 33 Borosilicate Glass Dimensions: 22.5 x 46mm/22.5 x 75mm Application: GC system Neck Diameter: 18mm