7 Facts About Tungsten Carbide Burrs and How To Use Them By Eternal Tools. All you ever wanted to know about the various shapes and what each one does, the different cuts, the shanks sizes available and how to use carbide burrs on all metals, all stone, ceramic, fibreglass, hard wood and reinforced plastics.
I needed to enlarge a previously drilled hole. Since I couldn’t use my hole saw’s pilot bit to center the hole, and I didn't have my drill press with me, I had to come up with a solution. What worked for me was to connect two hole saws together. One was the size of the existing hole. This saw "guided" the other hole saw that was the size of the hole I needed to drill.