The 0.3 ml clear glass micro-insert can be fixed in a 9mm 2ml HPLC Screw Vial, and the size of the inserted vial is 6*29mm. The conical bottom vial can save samples during the injection process. 9 mm wide open screw top cap for better needle injection. 9mm 2ml Screw Top Chromatography Vials for SHIMADZU.