I have a few of these already I use underneath a metal cabinet that sits above my work bench. The magnets on both sides are plenty strong. Punches and screwdrivers reside in mine. These are a little pricey but they seem to be worth it to me. These are sold under a few different brand names. Lowe’s sells this same holder but it’s red and says craftsmen. Also Matco tools sells this as well, but they are all the same.