Review on Masonry Drill for Concrete, Ceramic, and Plastic Surfaces by Douglas Davis

These bits are garbage! In fact, you only get 5 different sizes. They might be good for drilling plastic or glass, but totally useless when it comes to drilling masonry. I blew through every drill but the 1/8" bits and attempted to drill a 1/2" hole in the concrete. I started with a 1/4" bit first and kept going up as I burned out the club. I was only 3/4" deep!