Professional 250ul insert for hplc vials Aijiren SingaporeChromatography Vials, Caps, Septa & Inserts, Tubes, Crimper, Aijiren, Inc. 8-425 Screw Neck Vials ND8 Part No. Descriptio 250ul Insert with mandrel interior and polymer feet, 29*5.7mm; suits for ND9 Vials.