Polypropylene inserts. Product #. Description. Add to Cart. 24708. Insert for 2 mL standard opening vial, 4.6 mm I.D. volume 0.15 mL, conical polypropylene (with bottom spring), O.D. × H 5 mm × 30 mm, pkg of 100 ea. pricing. 24722. Inserts for 2 mL large opening vials, 6.0 mm I.D. volume 0.2 mL, conical polypropylene (with bottom spring), O.D. × H × I.D. 6 mm × 29 mm × 4.6 mm, pkg of 100 ea.