I'm glad it's a two-piece set. So if one burns out, you have the other to finish the job. They are well made and if you start your hole at a slight angle it will bite into the tile and then straighten the drill bit and go at the right angle and you will find it easier to do it. It only took 1 to work and it turned out great. They contain a wax center so you don't have to worry about them getting too hot, no need for water. We used this on porcelain stoneware and it only took a minute for each hole. Its worth it.
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