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, Easy to Use 3. 2ml Amber autosampler vial,12mm Diameter, 32mm Height, 9-425 9mm screw top, and included borosilicate type Volatile Organic Chemical sampling vial