I bought this for use in my home condominium, but I accidentally bought too many, so I'm selling the extra one. I've actually used this product, and compared to other products I've used, the magnets are quite strong, and the adhesive material makes it less likely to slip and is very sturdy. (It's a little heavy as a result.) I only need to adjust the position about once every six months. Also, it doesn't matter if your door is made of wood or aluminum, as it comes with a metal base that you can attach, so it can be used on any door.