PilotLights 12 Volt DC Pilot Light, 17mm Square Panel Indicator Light - Blue LED, 12VDC Compact 17mm square LED panel light Ideal as an indicator or warning light Daylight readable - 12 Volt DC Black plastic housing is 17mm x 17mm square. Mounts in a 15mm round hole Available in 12 Volt DC in WHITE, RED, BLUE, GREEN, YELLOW and BLUE colors - see other listings