I am a professional installer and have installed hundreds of mounts from almost every brand since 2005. For the price you can't go wrong. about iron, but that's okay. The people who broke the bolts either didn't drill a hole big enough or not deep enough. Use a 1/4" bit and drill as deep as you can and use a ratchet instead of an impact wrench. There should be some resistance, but if it gets too tight you'll have to dig deeper.
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