28/5/2020 · Aijiren's 2ml hplc autosampler Screw-top Vials is the best-selling product of aijiren, Because Screw-top Vials and caps are easy to use and require no special tools. The unique thread design provides a consistently secure seal, preventing evaporation. And Aijiren provides a variety of Screw vials, with openings of 8mm, 9mm, and 10mm, which can