As part of the SP series, the USP Mini Overhead Door Contact, Angled Magnet (2-1/4 in. Gap, NC) offers exceptional strength. The stainless steel, closed circuit (CC) contact is housed in cast metal and features a 24-inch armored cable. Each switch is also welded with a solid brass splice in order to provide the strongest connection possible. Made with rhodium metal contacts and rare earth magnets, these contacts are built for reliability.