350µL Glass Flat Bottom Insert w/ID Ring, 6x31mm 4035-631ID

Flat Bottom Glass and Polypropylene Inserts.Flat Bottom Inserts are an economical alternative to the conical limited volume inserts. Designed for use in 2mL large opening crimp top and screw thread vials. Available with ID ring, at the top of the insert, for easy open-end identification. Flat Bottom Inserts are available silanized or precleaned.