This set is a great choice for anyone who needs a quick and easy way to change holesaws. The set includes all the necessary parts for quick and safe hole saw changes. The universal quick-release adapter fits all brands, including Bosch, Makita, DeWalt, Milwaukee, Einhell, Ryobi and HiKOKI. The adapter is made of high-quality materials and is very durable. The hex key is a handy tool for attaching and removing the sleeve. The center drill allows you to make a starting hole in the center of the hole saw.