1) 9mm screw vials can be used on all common autosampler. 2) Short screw, long neck" to make the autosampler easier to capture. 3) 9mm wider opening for easy puncture. 4) Clear, type 1 class A borosilicate glass. 5) 9mm PTFE/silicone septa, has excellent chemical inertness, acid and alkali resistance. 6) 9mm screw blue open top pp caps.