Screw Top Autosampler Vial Convenience Kit. PerkinElmer. Vial: Size: 12 x 30 mm Volume: 2 mL I.D.: 8 mm Finish: Screw Top Description: Clear glass vial PTFE septa with black cap Cap: 8: 425 Screw Thread Color: Black Septa: PTFE/Silicone This cap will fit all industry standard 12x30 or 12x32 screw top vials.