Comparing with 9mm screw vial, this 2ml snap hplc Vials mouth is wider opening. So 2ml snap top HPLC vial is easier to fill and provides a larger target area for the autosampler needle. That is to say, the 2ml snap top HPLC vial can protect the needle. 2ml snap top HPLC vial size is 11.6x32mm, which can compatible to most autosamplers, such as