Aijiren 0.25 mL Vial Inserts, Glass, Flat Base, 100 pcs/pk. Micro volume vial inserts, when used in conjunction with autosampler vials, allow for maximum sample recovery and easier sample removal because the conical shape decreases the surface area inside the vial. Micro volume vial inserts can be used with screw tops, crimp top, or snap top vials. High recovery 250ul hplc vial inserts supplier Thermo Fisher