Inserts, Low Volume, Glass. Clear, 350ul with a wide, conical point and 6x29mm outer dimensions for use in the Micro-Sample Management System. Replacement Inserts. U-2D Brand. Additional Info: Inserts are 1st Hydrolytic, Class A, TYPE 33 Borosilicate Glass made for use with the U-2D Micro-Sample Management System Rack or with 12x32mm, 2ml AQ Brand autosampler vials. Wide conical points help with fast filling and minimizes bubble formation in the insert.