Certified Kits, screw thread vials, 12 x 32 mm, 9 mm thread, unassembled, pkg of 100 volume 2 mL, clear glass vial (with graduated marking spot), PTFE/silicone septum (bonded to cap); find Supelco-29381U MSDS, related peer-reviewed papers, technical documents, similar products & more at Sigma-Aldrich