Stay safe with the 1 oz. Amber Boston Round with Light Grey Child-Resistant Dropper! It's economical and environmental to create your own essential oil mixes, pet remedies, or cleaners for around the house. However, children loan an extra layer of necessary safety with these items. Use this handy, tiny bottle for your favorite mixtures while keeping the kiddos away.
Closure sizes are expressed using two different numbers.
For example, a closure size of (20/400) has a diameter of 20 mm and fits a bottle with a 400 GPI thread finish.
Some neck sizes are interchangeable. For instance, a 20/410 closure will usually fit on a 20/400 bottle. Also, 410 and 415 are usually interchangeable if the closure is not tamper evident.