Standard Opening borosilie glass gc headspace vials. Autosampler Vial,Clear Chromatography Lab Vial,HPLC 3. Screw Neck Vials ND8,small opening,8-425 thread 4. Write on spot and Graduations at 0.5,1.0,1.5 5. Standard Autosampler Vial for HPLC & GC Chromatography,vials can be used for high performance