9mm screw thread caps, septa, and 9mm 2ml Hplc Screw Vials are designed especially for use with Aijiren's and other rotating or robotic arm samplers. 9mm 2ml Hplc Screw Vials are manufactured of Clear glass,Type 1 Class A or Amber, Type 1 Class B borosilicate glass and include a write-in patch for sample identification.