Volume: 250ul. Dimension: 5.7x29mm. Material: Clear Glass. Suit for: 9mm, 10mm, 11mm vial. Bottom: Mandrel with polymer feet. 250ul Clear Glass Micro Inserts with Spring Bottom, for 9mm, 10mm, 11mm hplc vials. The workers of Aijiren in the picture are packaging the Micro-Insert. This kind of Micro-Insert is usually suitable for Autosampler Vial.