Standard Opening clear vials with caps with high quality for Autosampler Vial 9-425 Screw Top Glass Vial,Wide Opening,2ml,Aer,Write-On Spot,100/pk Part NuerCRX2000-1002 Vial volume 2ml Vial size 12 x 33 mm,9 mm diameter Wide opening to prevent syringe problem Write-on spot available Compatible with most common HPLC or GC instruments.