These are very good quality masonry bits. Bricks stamped like butter and also ceramic tiles. I don't have any porcelain tiles to use for testing. They're always a challenge, but I suspect they'll work very well. I like that they each contain two small pieces that tend to break over time. BTW after my testing the black finish was completely intact. I like the hex shank to keep it from slipping in the chuck and each drill bit is clearly marked by size at the base of the shank. Comes with a storage case, tube or even a small bag. However, I found an old Craftsman bit case in my garage that they fit. I see no point in deducting stars because I don't have a storage box because I knew that when I ordered it. Just a respectful suggestion ie to the manufacturer. I've used many pieces of masonry over the years, some good and some junk, and these are some of the best I've used. Great product at a very reasonable price. .
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