VWR®10mm WIDE OPENING SCREW-THREAD VIALS 2ml, 12X32mm 10mm WIDE OPENING SCREW-THREAD VIALS AND INSERTS. ‒ 10-425 thread finish ‒‒Vials feature a write-on patch with graduation for convenient sample identification. ‒Wide-neck opening design allows for easy filling; requires inserts with a diameter of 6mm.