Colpak 9mm screw thread vials have a 9-425 GPI thread and the closure is dimensionally equivalent to 11mm crimp cap vials. This means that they can be used in any auto sampler that uses 11mm crimp cap vials. All the 4 types of vials are available Including clear , patched graduations mark, amber and amber with graduations. 9mm screw caps have an advantage over 11mm crimp caps because 9mm screw caps can easily be applied and removed by hand and they can be reused. caps are off different type as mentioned in product title i.e either simple or knurlled, with silicon white and PTFE red with or without slit.
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