Free sample IP250 micro insert vial suit for 9-425 Sigma Inserts for 9-425 Screw-Top Vials For limited volume sampling in 2 mL sample vials Snap to Vials, Specialty Snap to Vials, Specialty Snap to Vials, Specialty Virtually no adsorption or pH effects Precisely centers and fits vial neck Offers maximum opening to sampling needle Ordering Information* Description Insert, 6 mm Diameter, Flat Bottom