Review on 🔧 Masonry Carbide Drilling Ceramic Plastic: The Ultimate Versatile Tool by Erik Peterson

I ended up only using them to drill holes in porcelain stoneware. They bite well and cut well, but I either couldn't keep them cool enough or they probably aren't that good. There were similar results with bits on masonry. The best bits to start a hole as they don't actually crawl all over you. The smallest drill broke off while drilling the second hole. The second smallest, but came to me bent. I used the third smallest to start the holes and then switched to a 1/4 inch diamond round cutter which I also found on Amazon and loved.