JG Finneran 50 μl Glass Conical Limited Volume Insert, 4x25 mm Precision-Formed Mandrel Interior, with Bottom Spring, 100 pc/PAK

Conical Glass Inserts - Precision-Formed Mandrel Interior. Inserts are available preassembled with a polymer bottom spring. The polymer spring acts as a shock absorber that protects against breakage if the needle bottoms out. The conical design permits complete sample removal.