The screws that go into the wall to screw the doorstop are extremely weak and malleable which is a terrible combination with the knob being designed for a flat head screwdriver. Even slight tugging on these screws will cause the screwdriver to slip and snap off the screw head, rendering the screw useless (and you only get 1 screw per doorstop). This happens even AFTER you've pre-drilled the screw hole. The screws are just terrible. If I were you I would get a different set of doorstops from a different brand.
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