Mar 21, 2022 · Vial Material : Clear Type 1, Class A Borosilicate Glass ; Easy to Use : 9-425 screw top vials is 40% larger opening than standard narrow opening vials, 2ml HPLC Vials with Unique Thread Design Ensures Consistent Seal and Can Be Reused, Not Volatile ; Vial insert Dimensions: 31 x 6 mm ; Vial Insert Fill vol: 0.3ml ,Usable vol:0.25ml