The WCS SB357 Magnetic Snap Trap Base uses powerful magnets to secure rat-sized snap traps to metal surfaces such as structural beams, pipes, ducts, dumpsters, and other equipment. It provides a fast and secure way to mount traps in difficult locations. Simply slide a rat-sized snap trap into the base under the tabs and set the trap. The two powerful magnets will hold more than 35 pounds, and will not wear out, the company says. Visit online for the list of manufacturers’ snap traps (sold separately) that fit the magnetic base.