Once tried similar but with button neodymium magnets placed on a tin sheet holding various bits and pieces. Handy for some stuff that is small and easy to misplace.
I do a lot of metal work from time to time and the magnets eventually became full of metal filings and drill bit swarf. Became a problem with cleaning up but the final straw was a savage metal splinter in the thumb while grabbing a drill bit from the magnet. I dismantled the system and went back to wooden shelving.


				
				
				
					
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