8mm Screw Thread Closures--Aijiren Vials for HPLC/GC. 2021 - 08 - 19. 8mm Screw Neck Headspace Vial Capacity: 0ml, 20ml Color: clear and amber Bottle mouth diameter: 8mm Supporting Cap: Screw Neck magnetic precision Cap Scope of application: gas chromatography Applicable brands: Aijiren, Thermo Fisher, Waters, Shimadzu, etc. Inquiry.