Essential for ease of use
I use Dremmel drills mostly and this chuck makes changing the burr etc. so easy and quick. Couldn`t be without it. Only one problem is it traps a lot of dust from working on feet and nails which is difficult to clean out and if cleaned the normal instrument way, it rusts and will not work. Have been advised to try pressured air (don`t know where to get this) and silicone spray to ease internal mechanisms.