These are excellent boxes for the purpose for which they were designed. You can accommodate a variety of cords along with an extension cord. The only caveat I would like to make is that the lids on these boxes do NOT come off easily. If you have to remove the lid (to disable or add something), you'll be scratching these tight-fitting lids like an otter with your fingernails. I often unplug my TV to reset it, so this is not a good solution for my TV's cable. BUT for other places where you don't need to access boxes very often, they're great. Lids hold up very well, of course!
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