A bottle and closure must have a matching neck size to be compatible. 

The screw thread closure size is written as two numbers separated by a slash.
For example: 24/410

24 = The diameter (mm) measured across the outside of the bottles threads or inside the cap opening.

410 = Refers to the thread style

Thread styles

 How to determine your bottles neck size

1. Measure the diameter of the outmost threads (the ‘T’ measurement)
2. Determine how many times the threads pass each other

For example: 24mm 'T' Measurement 1.5 Thread Turns = 24/410 Neck Finish