- Screw top vial,2 ml,glass 0.2ml insert. Vial, screw top, polypropylene, with glass insert, 250 µL, 100/pk. Vial size: 12 x 32 mm (12 mm cap) Manufactured from virgin polypropylene, meeting requirements of 21 CFR 177.1520 Wide opening glass/plastic vials have a glass flanged insert molded to the inside, so sample only comes in contact with high quality glass insert and septum