This means that 2ml snap-top HPLC vials can protect needles. The 2ml snap-top HPLC vial size is 11.6x32mm and is compatible with most autosamplers such as Aijiren. 2ml HPLC vials are available in amber and transparent colors. The bottom of the vial is flat. It is convenient to put. Aijiren offers 2ml snap-top HPLC vials and pads at wholesale