We had a metal safe we wanted to mount a 18 in. x 18 in. dry erase board to and couldn't drill holes for mounting and don't think 3M double sided tape would work, tried these magnets that fit perfectly in the grooves of the frame, I don't know how I got that lucky. Two on top and two on each side for a total of 6 and that white board is holding on there like a "Beast".I did use the double sided tape that came with it, as when you pull the board off, the magnets stay on the wall surface. With the tape it stays on the white board so you can move it all around.Love these things.
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