Screw Top Vials,Caps and Kits|laboratory vials cheap Scientific-US. Screw thread vials & closures for HPLC,GC,MS appliions. There’s a Aijiren screw top vial for every HPLC,GC,MS instrument,appliion,and budget. Our screw top clear and Aijiren glass vials and plastic screw top vials are available in 8mm,9mm,10mm,and 13mm screw threads.