I use these all the time now, for mounting pictures, iPad mount, the sky router, you name it. They fit together a bit like Velcro, but they make a nice reassuring click so you know they are together. Make sure you follow the instructions, you don't want something precious falling on the floor. It tells you on the box how much weight they can take and you can use one, two or three strips depending on the weight of the item you want to hang. Such a brilliant idea instead of nails or picture hooks, which look so untidy when you try to take them out. They are easy to take off the wall and your item too and leave no mess! Perfect!