Don't let your metal roofline, gutter, staircase, or fence go bare this holiday season. These green magnetic C9 replacement sockets have intermediate bases and attach to SPT-1 wire. These are a great little gadget to have when you are decorating a metal roofline or you merely need to replace a non-functional magnetic socket. UL listed for indoor and outdoor use, the nickel protective coating prevents rust. Let your roof look merry and bright with its own holiday lights this season.