250µL Flat Bottom Glass Inserts for Chromatography Vials. These Flat Bottom Glass Inserts are designed to be used in 2mL standard opening crimp top and screw thread vials. They represent an economical alternative to the conical limited-volume inserts. Clear Glass Micro Insert is used to ensure the most accurate and reliable analysis of your lab samples. Micro inserts, when used in conjunction with autosampler vials, allow for maximum sample recovery and easier sample removal. The 250µL Glass Flat Bottom Inserts make an excellent choice to daily chromatographic experiments in the lab combining the highest quality and consistent results with low cost. A must-have for your research.