Opening Diameter: 8mm, 9mm, 10mm, 11mm, etc. 2ml Hplc vial size: 11.6x32mm. 9mm and 11mm hplc vials are the most widely used, compatible with most Brands of autosamplers. We Can Provide Free Sample for Test. MOQ: 100 packs (10000pcs) HPLC Vials (Part of the Products)