* Quick and easy tool change, thanks to the quick release. * The "Drill & Drop" system makes it possible to easily and quickly remove the cut material. The quick-release button that releases the center drill allows you to easily pull the hole saw towards the machine and easily remove the material. * The "Drill & Drop" system is maintenance-free. * The "Drill & Drop" system allows you to increase the size of an already existing hole by combining two hole saws at the same time. The smaller hole saw guides in the small hole and with the larger one you can easily get a larger hole.