The screw top 2ml sample vials made by Aijiren has openings in three sizes: 8mm, 9mm and 10mm. The 8-425 is usually suitable for Shimadzu autosumplers. The opening is not large enough for an automatic needle. The 9mm 2ml Glass Vial is the best-selling 2ml GlassVial in Ajiren because it can accommodate most autosomplers.