This thread is much higher on the top of the vial allowing space between the bottom of the thread and the shoulder of the vial. Aijiren 8-425 Screw top HPLC vial The 8-425 screw HPLC vials are made of borosilicate glass, which size is 11.6x32mm. 8-425 screw HPLC vial are preferentially used on instruments of the following manufactures:Beckman, CTC, Gilson, Knauer, Shimadzu, Spark, Varian,