This Horn Button is a panel mounted, push button, momentary On-Off switch for operating fog horns, sirens etc. Mounts in 1/2" diameter hole and is wired with 1/4" QD terminals. Nylon/phenolic and chrome-plated brass construction. This horn switch comes with either a standard black button or bright red button to make it easily identifiable in emergency situations. Maximum panel thickness: 5/16?. 15A @ 12VDC. A 5/16" B 1/2" Amps 15 Color Black