Certified Kits, screw thread vials, 12 x 32 mm, 9 mm thread, unassembled, pkg of 100 volume 2 mL, clear glass vial, PTFE/silicone septum (with slit), septum bonded to cap; find Supelco-29379-U MSDS, related peer-reviewed papers, technical documents, similar products & more at Sigma-Aldrich.