I am making some cabinets and wanted to have adjustable shelves. Rather than make my own jig, I purchased one of these. Wow, am I glad I did! After watching Youtube videos showing the use, I was drilling holes minutes after the package arrived. Having a drill with depth stop allowed me to place exact holes at an exact depth. Tearout was minimal, and can be avoided somewhat by a fast drill and no pressure at the start of the hole. Great product!