My plastic box was "full" with a drill bit and a masonry bit. I have a concrete house and use them throughout the house. Probably 40-50 of them. None of 1 broke. broken or something. If you look at other people's problems in their photos, you can clearly see that the thread of the screw has been torn off. This is an indicator that they are using the wrong masonry OR. they "drill" something other than the concrete of the first. These are "BETON" screws. When "drilling" wood you must first use the "wood drill" and THEN use the concrete drill after going through the wood.
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