Product Description. 1.Short screw Thread ND9 vials (11.6*32mm) for GC and HPLC. 2.Wide opening can effectively prevent the risk caused by the excursion of injection needle. 3.Available as closed top screw seals or with centre hole. 4.Available with black or blue screw caps with 9mm thread. 5.Vials with integrated Micro-Insert are also available.