2 mL Clear Vials, 9-425 Screw-Thread, Graduated Write-on 801923. 2mL clear vials with 9-425 screw-thread are specifically designed for robotic arm autosamplers. Vials are manufactured from clear Type 1 borosilicate glass and have graduated (0.5-1.5mL) write-on spot. Vials are tested and guaranteed to meet or exceed critical performance ...