Web2020/6/4 · The outer diameter of the accessories is typically 5 or 6 mm, so be sure to choose the size of the HPLC Sample Vial that fits the insert. Bottles with an outer diameter of 11 mm, 10 mm or 9 mm can fit in either size, but vials with an outer diameter of 8 mm can only use inserts with an outer diameter of 5 mm. This comfort eliminates the need to