HPLC Syringe Filters 20 mm Headspace Vials, Septum, and Caps - US Round Bottom: Volume (Metric) Total: 21 mL: Vial Type: 20 mm Headspace Crimp Vial Convenience Kit: Closure Material: Aluminum-PR: Closure Type: Crimp Cap (Open Top, 7.5 mm hole, Pressure Release) Height (Metric) 75 mm: Type: Unassembled Crimp Top Vial Convenience Kit: Closure Size: 20 mm: Septa Size (Metric) 20 mm: Unit Size: Case of 1000