I returned these. The magnets were not strong enough for my application. Mounted in a box on the back of a truck to store some tools for quick access. Nothing heavy, screwdrivers, knives, nuts, bolts etc. Maybe I asked too much for them, although I think a tool magnet should keep the screwdriver in the car on flat roads. The key is hardly held by the magnet. Wouldn't buy again if the collar holder magnets have more holding power. One of the brackets was also broken. Apparently they were returned earlier which would have been nice if they worked. Cheaply made and doesn't work properly.