I want to use these magnetic hooks to hang electrical/charging cords underneath my moveable, lighted desktop to keep them off the floor and out of the way. The shape of these looks better for my purpose than the others which have a more relaxed design. However, the overall size of this hook is too small for more than 1-2 loops of phone cords therefore computer or electrical cords are out of the question. Things are hard to predict from pictures. The opening is 7mm at narrowest, the depth is 11mm at deepest. If it fits your needs, these are very strong magnets. Hope this helps.