8-425 screw-thread vials are the original, standard opening vials. Vials are manufactured of Clear or Amber borosilicate glass. Available with a standard graduated write-on patch for easy filling and identification of samples. Requires the use of 8-425 closures and 8mm septa.2ml Autosampler Vials 8-425 neck finish represents HPLC vials &gc vials, the vials a diameter of 8 mm across the outside of the threads and a thread style of 425, Vials has clear and amber, Screw Cap in Lab most of the 2ml vials are 12*32mm. Strictly quality control to ensure the consistent size of each lot of 8mm Screw Vials.