9 mm wide-mouth threaded PP HPLC vials: 9 mm screw caps, septa, and vials are designed for use with Aijiren and other rotary or robotic samplers. 12X32 mm vials are made of polypropylene with internal The micro-storage inner tank, this micro-groove can increase the storage level, and facilitate the sample to draw liquid from the automatic injection needle inside the Vias.