Laboratory Analytical Micro Insert 250ul Glass - Alibaba. 250uL Conical Micro-Insert 250uL Conical Micro-Insert,31*5.7mm, Suits for 9mm Vials ; Box Package 250uL Conical Micro-Insert,31*5.7mm, Suits for 9mm Vials; White Box Package 1)Standard vials for GC and HPLC 2)Clear or amber, borosilicate glass 3)Broad range of Micro-Inserts 4)Small opening requires Micro-Inserts with a diameter of 5mm