2mL Amber Glass Screw Top Autosampler Vials are available in a variety of neck finishes and opening diameters. Large mouth or wide ID vials have approximately a 40% wider mouth opening than standard opening vials. Rated 4.9 /5 based on 365 customer reviews. 2ml hplc vial 2ml screw vial 9mm screw vial. Free Sample Get Price.