Review on Masonry Drill for Concrete, Ceramic, and Plastic Surfaces by Keith Desjarlais

Do not use these drills. They are softer than jelly. I drilled 5 holes with 2 bits of the same size. Both drills will be destroyed at the end. Coolant was also used during cutting. For the last hole I had to increase the size because the first two were toasted. To advertise her as a commercial strain is a joke. In the photo, the center drill should look like what the two extreme ones should look like. The "Carbide" tip melts shortly after touching the masonry. I never see them cutting glass or tile. You get what you pay for.