2020-5-12 · 1. ND9mm Screw Thread Autosampler Clear Lab Vials are made of clear Type 1, Class A Borosilicate Glass with a writable label for sample identification. 2. 2ml HPLC Vials with Unique Thread Design Ensures Consistent Seal and Can Be Reused, Not Volatile, Easy to Use; 3. 2ml Capacity,12x32 mm Dimensions, Screw Thread 9-425 Neck,100/pack; 4.