Micro-inserts, ND8 for small opening | VWR. Learn more about Micro-inserts, ND8 for small opening. We enable science by offering product choice, services, process excellence and our people make it happen. Micro-Inserts--Aijiren HPLC Vials. 250uL Conical Micro-Insert, 31*5.7mm, glass 2ml hplc sample vials with Cap for wholesales 1.5mL 9-425