Screw thread vials & closures for HPLC, GC, MS applications. There’s a Aijiren Tech screw top vial for every HPLC, GC, MS instrument, application, and budget. Our screw top clear and amber glass vials and plastic screw top vials are available in 8mm, 9mm, 0mm, and 3mm screw threads. The most commonly used vials are 9mm, 2x32mm screw