China 20mm Crimp-Top Headspace CTC Vial ND20 Manufacturers . 6).Crimp-top Aluminum Cap, 10mm Centre Hole Φ20m . 7).Crimp-top Blue Magnetic Aluminum cap, 10mm Centre Hole Φ20mm available. About 6mL vials: 1).6ml crimp vials ,22*38mm . 2).suitable metrohm instruments . 1.20mm Headspace Crimp Vials ND20