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 vials9-425 Vials,8-425 Vials,10-425 Vials,13-425 Vials,10ml GC Headspace Vials,20ml GC Headspace Vials etc. Want to Know More Please Leave Your Message !