Not a good purchase, broke in less than a minute

I was using these to remove grout and the metal connection at the tool broke on one side. I assumed it was an fluke or an error on my part so I adjusted the blade attachment to the tool to connect to the unbroken part of the blade. While doing so, I noticed that the abrasive was failing but there was enough left to keep going. This time it broke within 20 seconds. I was going slowly to avoid putting stress on the blade, letting the tool do the work and not forcing it. Here is the second blade that failed by breaking at the connection. The first I threw away assuming it was my error. But when it happened again, I realized that I had wasted my money on this product. Please don't make the same mistake.

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