Autosampler Vial, Clear Chromatography Lab Vial, HPLC LC GC 1.5 ml Wide Opening Short Screw-Thread Sample Vial with Write-on Spot, Clear, 12x32mm, 8-425 Top Type, 100 pcs/pk by Aijiren 1. ND8mm Screw Thread Autosampler Vials are made of clear Type 1, Class A Borosilie Glass with a writable label for sample identifiion.