The N1178CB-STFB from Nascom is a recessed 3/4" stubby open loop switch / magnet set for steel / wood doors, wire leads, brown. The N1178C Series is a 3/4" recessed wide gap stubby door contact designed for residential, commercial and industrial steel and wood door applications. The N1178C is the installer's choice of contact configuration because the contact set is designed to cut installation times and helps to prevent false alarms caused by shifting or warping doors. The N1178C Series is designed for installation in every type of hinged door including wood doors.