At present, 2ml glass vial contains three different types of vial: Screw Top,Snap Top and Crimp Top. The Screw Top 2ml Glass HPLC Vial produced by aijiren has three sizes of apertures, 8mm, 9mm and 10mm. 8-425 is usually suitable for Shimadzu autosamplers. The aperture is not large enough for automatic injection needles.