Since they can be dismantled, storing them in small cases is a great way to avoid size confusion. And the labeling on the containers allows you to find the right piece the first time. They need water to work to ensure the longevity of the bit, otherwise they will definitely wear out prematurely. This is a good set with the most useful sizes. Their quality is excellent and stable throughout the set. Very good. Four stars ⭐️⭐️⭐️⭐️!