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, VWR (Merck®)/Hitachi, etc 2ml 10-425 Certified Screw top HPLC vial The sample vial standard is 4.6mm and large