The 2.5 in. Closed MIDI Hook uses patented technology to securely hold your heaviest tools and equipment up to 25 lb. on thin steel surfaces. Get heavier tools and equipment off the floor and store them right where you need them with this Gator Magnetics 2.5 in. Closed Hook. Gator Hooks use a proprietary magnetic technology with over 100 patents that allow them to hold exponentially more weight than traditional magnets. They attach safely to all steel surfaces commonly found in the workshop or garage.