There are high performance liquid chromatography & gas chromatography consumables such as HPLC/GC screw vials with matched caps for laboratories. Here is the list of some screw vials: 9-425 Vials,8-425 Vials,0-425 Vials,3-425 Vials,0ml GC Headspace Vials,20ml GC Headspace Vials etc. Want to Know More Please Leave Your Message !