Center Drain (CD) screw thread vials, heavy wall, with caps and PTFE/silicone septa volume 2 mL, amber glass vial, without graduations, O.D. × H 20 mm × 40 mm, pkg of 12 ea; find Supelco-29368U MSDS, related peer-reviewed papers, technical documents, similar products & more at Sigma-Aldrich