[CHROMINEX] CRX2000-5001 Micro-Insert 250ul, clear, bevelled bottom with assembled plastic spring, for 2ml 9-425 screw top glass vial, 100/pk · Home Tisch Scientific 250 µL Micro-Insert, 29 x 5.7 mm for 9 mm Vials . Micro-Inserts are designed for consistent sampling of low-volume chromatography samples. 250 µL, Mandrel/Polymer Bottom, 29x5