This is a very well made drill chuck. It does not automatically center the drill like a three-jaw chuck. I use it with a mini drill press. I just pop it into my mini chuck like a regular 1/8" drill bit and voila, instant conversion without changing anything. It's best to load the bit into this chuck before inserting it into the drill. If you do it like this makes it easy for you to get the bits right centered this little guy is really cool when you figure out how to load him properly this is a steal at less than $5 and I have a feeling my money well spent.