Flat bottom 250ul chromatography vial inserts suit for 9-425 Chrominex 9mm Autosampler Vials-MicroLiter (11) 9mm Screw Thread Caps-MicroLiter (3) 9mm. 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, 29x5.7mm for 9mm vials, CV2042, Chrominex Micro-Insert 31*6mm, clear class, Flat bottom, for 9-425 . Name:Chrominex Micro-Insert 31*6mm, clear class, Flat