Very ineffective.

If your walls have even the mildest texture to them, don't bother. I spaced a bunch of these a foot apart from one another and it would not support a run of cat5. Wound up going through 4 packs worth of the sticky tape to get one packs worth of hooks up, and those are slowly falling off one by one. I'm going to try drilling holes through the plastic so I can use nails to secure the hooks, though I wish I'd just spent the money on a cable stapler instead.

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