Overhead Door Magnetic Contact Set ALARM Overhead Door Magnetic Contact Metal Screw terminals make installation fast and easy. - All-purpose mounting bracket. The TANE MET44WG18 Overhead Door Contact Set is a miniature low-profile reed switch in a cast aluminum for durability in harsh environments. The MET44WG18 features a wide working gap of up to 2" with 18" of heavy duty armored cable for protection from the elements and a versatile universal magnet which can be mounted at various angles for those difficult installations.