My car headrest in a Volvo have no visible rods, but I was able to squeeze the hanger under the rest and hook on to the rod without too much trouble. The length is not adjustable and the two hooks are so close together that u can't use each for anything more than plastic bags. I use both hooks to hold my purse in the front of the passenger seat. After spending way too many times picking up the contents of a spilled purse, I won't be without this little gadget again. I use another hanging on the back of the front seat to hold plastic bags. Though I like it to keep plastic bags neat, I find that keeping my purse secure during my long work commute and hours of errands is really where this shines. And when there's a passenger, it very easily and quickly slides around to the back of the seat. I'm going to get several for stocking stuffers. If you're a busy lady with a good sized purse, you will find this extremely useful.