All MicroSolv products with special emphasis on, chromatography Inserts, 5x31mm, flat bottom. 9mm Screw Top Vials and Caps – Easy Purchase Packs. HPLC Chromatography Vial - Alkali Scientific Insert for HPLC Chromatography Vial, 5mm for standard Chromatography vials, clear glass, conical shape, 5.6 x 31mm, Pulled-point conical glass insert,