Review on 🪚 Ceramic Marble Concrete Drilling Carbide Bit by Matt Conner

The first two tips I tried got hot enough to melt the "solder" holding the cutting tips. The second two cutters dulled very quickly (1 minute or less) but did not fall apart. With a copious jet of cooling water and a low-speed cutter, they got the job done. In total I used 6 bits for 12 holes in the wall tile. I only bought them for a job and they did it. I wouldn't buy if I needed reliable heavy duty drill bits.