Relating to plastic bottle necks, these are continuous neck thread sizesthat are generally expressed as two numbers.The first number refers tothe neck diameter.The second number refers to the height and threadconfiguration of the neck finish (in millimeters).

The ideal choice depends on what your product is and what works bestas far as height, width and volume.

There are 5 different measurements on a neck finish.Click on the letterbelow for the definition.