Micro-Insert Suit for 2ml HPLC Vials from Aijiren. 2020// · There are usually three types of Micro-inserts produced by Aijiren, 250uL Micro-insert with mandrel interior&polymer feet, the specification is 29*5.7mm, 250uL Conical Micro-insert, the specification is 3*5.7mm, 300uL Micro. 8mm HPLC Screw Neck Vial for Autosampler--Aijiren HPLC