Shimadzu conical micro insert for gc vials-aijiren HPLC Vials. 1.5mL 8-425 Screw Neck Vial ND8. 1) 8mm screw vials can be used on all common autosampler . 2) Standard narrow neck design for GC and HPLC. 3) 8mm wider opening for easy puncture. 4) 8mm PTFE/silicone septa, has excellent chemical inertness, acid and alkali resistance.