ND9 screw vial-Aijiren Vials for HPLC/GC. Clear Glass Screw Thread Vials are 2mL, 12x32mm and built with Advanced Vial Closure System (AVCS). This innovation not only prevents septa push through, but provides a stop point for the cap to prevent over- or under-tightening and provide an optimal, consistent seal every time. Inquiry.