Our AIR-TIP Magnetic Utility Nozzle has integrated magnets that catch metal hardware, preventing damage to bags and filters inside of a wet/dry vacuum. The magnetic strips are located on the front and back of the vacuum tool to catch metal hardware before it gets inside the vacuum. The black zinc coating on the magnets prevents rust long-term. The MILWAUKEE AIR-TIP Magnetic Utility Nozzle is compatible with other wet/dry vacuum brands with 1-1/4in, 1-7/8in, 2-1/2in diameters, and is part of the AIR-TIP family of Trade Focused Vacuum Accessories.