9mm Screw Closures Factory--aijiren Vials for HPLC/GC. aijiren 9mm HPLC Vial in Amber Glass for aijiren Tech. The 9mm screw neck vial is the 9mm screw neck vial, which has the highest sales volume among aijiren’s HPLC vials, because it can be used with most autosamplers on the market. In addition, the 9mm screw neck vial has a wide mouth and