aijiren Standard Opening 12×32 Vials:8-425 screw-thread vials are the original, standard opening vials, Vials are manufactured of Clear, Type I Class A or Amber, Type I Class B borosilicate glass, Vials have a standard graduated write-on patch for easy filling and identification of sample. Buying aijiren’s 8mm hplc vial requires an 8-425 cap