Our screw thread vials are designed with a continuous thread "CT" finish, permitting a positive seal, ideal for a variety of uses including laboratory or manufacturer's use. These vials are available in a wide range of sizes in both clear (flint) or amber, and packaged in attractive, white low-particulate cardboard boxes. All glass vials may be ordered without caps, caps attached or caps packed separately. Choose from our standard black polypropylene cap with a polyethylene foam liner, our highest quality, chemical resistant Teflon® liner or a black phenolic Polycone closure.