I originally designed these for my wife's Honda Odyssey minivan as very simple unobtrusive mounts so my kids had a place to prop up their phones on road trips. They ended up being so much more useful than we expected. Now we use them all the time not only for propping up phones and tablets, but as utility hooks for holding grocery bags, purses and other small items. The design allows them to fold away and overlap under the headrests so they take up no space. These were designed to fit the roughly 12.7mm diameter headrest mounts found on most Honda's but they are very simple and should fit on anything with the same sized headrest mounts.