2mL, 12x32mm, 8mm Standard Opening Screw Thread Vials and Inserts t 8-425 thread finish t I-D vials feature a write-on patch with graduation for convenient recommended konik autosampler vials. 20 mL Vials using 20 mm crimp caps (32 vial tray). For P&T mode AS Compatible with most GC and HPLC autosamplers using 12 x 32 mm (1.8 mL) vials.