Our standard 2 mL vial is 12 mm in diameter, 32 mm in height, and has a 4.6 mm opening. The main application for HPLC, autosampler, chromatography, Aijiren, waters machine. All autosamplers of Ajiren Tech are 100% integrity tested and manufactured according to ISO 9001 standard. If a 2ml screw HPLC vialsis required.