Tisch 250µL Micro-Insert, 31x6mm for 8-425 Vials, Conical Bottom . Micro-Inserts from Tisch are designed for consistent sampling of low-volume chromatography samples. 250 µL, Conical Bottom, 31x6mm for 9mm vials, CV2046, 1.5ml 150ul-250ul Zhejiang Aijiren 2ml 9-425 Chromatography . Thread Vials With Micro Inserts Conical Bottom 5mm Hplc Vial