Buy - 20ml Headspace GC Vials. Product Code, Glass, Type, Neck Size, Glass Specs, Vial Feature, Pack Size, Case Lot Vials, 20mL Headspace vial only, Crimp Cap Style, 75,5 x 22.5mm Vials, 20mL Headspace vial only, Crimp Cap Style, 75,5 x 22.5mm, clear glass, Round bottom, 100/pk. Screw Headsapce Vial