I use the rectangular Mayo jars from Kraft to store various items in the shop,decided to build a rack to hold them, had six of them lined up on my tablesaw top to get the measurements, in one I had tossed a small magnet,flat 1X2' ,it adhered to the tablesaw top,it occurred to me that this might come in handy when changing scroll saw blades or etc. as it was just enough force to hold the container in place but easily removed. I use these containers to store numerous items such as jig saw blades, recip blades,odd drill bits etc. Just thought I would pass this along.