8mm Open Top Screw Cap with flange, 8-425 thread, 5.5mm hole: Color: Pink, Blue, White: Material: PTFE, Silicone: Pre-slit: Yes: Volume (Metric) 2 mL: Septum: Blue PTFE/White Silicone, Pre-slit: Closure Material: Polypropylene: Closure Type: Open-Top, Flange Screw: Quantity: 100: Thickness (Metric) 0.9 mm: Closure Size: 8 mm: For Use With (Equipment) 8-425 Standard Opening Screw Vials