Feb 28, 2021 · Aijiren's 1.5ml sample vials can be broken up into several different types depending on the diameter of the bottle's mouth, 8mm, 9mm, 10mm and 11mm. Among them, 11mm can be divided into crimp top vial and snap top vial. 8mm, 9mm and 10mm are threaded. This is because the thread type is very convenient to operate and compatible with most