The 1.5ml chromatography vial and cap are easy to use and do not require any special tools. The unique thread design provides a consistently safe seal and prevents evaporation. The 2ml clear screw glass vial is available in 8-425 (8mm) and 9-425 (9mm). Clear screw vias of 8-425 or 9 mm can be found in the Ayjiren shop.