1.5mL/2mL screw neck ND8, small opening, 8-425 thread autosampler vials with matched PP screw seals ND8, PTFE/rubber septa & micro-inserts. 2ml Clear & Amber Glass Screw Neck HPLC Vials--Lab Vials The Screw Top Vials produced by aijiren are available in three different calibers, 8mm, 9mm and 10mm.