Pre-Assembled, 2 mL Wide Opening Screw Top Glass Vial Convenience Packs Pre-Assembled, 2 mL Wide Opening Screw Top Glass Vial Convenience Packs Description Unit Part No. Clear vials, blue screw caps, PTFE/red silicone septa 100/pk Clear vials with write-on spot, blue screw caps, PTFE/red silicone septa 100/pk