2ml Clear autosampler vial,12mm Diameter, 32mm Height, 9-425 screw top, and included blue ABS Screw Cap & Septa (PTFE/silicone septa) and clear Bevelled bottom Micro-Insert (31*6mm) Standard Autosampler Vial for HPLC & GC Chromatography, vials can be used for high performance liquid chromatography and gas chromatography for reliable analysis