HPLC Vials-Clear Screw Neck HPLC Vial Thread Standard Screw Thread HPLC VialsScrew thread caps and vials are often used in conjunction with laboratory vials supplier,Spectra-Physics,Varian,and other autosamplers; Vials are manufactured of Clear,Type 1 Class A or Aer,Type 1 Class B borosilie glass and include a write-on patch for sample identifiion