Perfect for mounting our holders on a steel lined safe. These are the best and strongest magnets (42lb pull) we have been able to find. 2-3 per holder if you have any question about how many you need please email and ask. Due to the many different paints and coatings some surfaces may not hold fully loaded large capacity mags in some rare cases.
Caution these are very powerful magnets and extreme care should be used when applying or removing them, they can cause you to pinch a finger or break a magazine holder if you aren’t careful.