The included drill bit is oversized and bent, causing the hole to be larger than the thread so nothing can bite into it. Used same size drill bit but from my set which is straight it was still too big. I had to reduce it 2 sizes so it was tight enough not to loosen just when turning the bolt. I'm glad I tested it first, but you'll most likely need a different drill. The price was right and they work well once sorted out
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