Kingbright 3mm Single-Level LED Indicators - Single Block. This family of PCB LED indicators, from Kingbright, are right angle LED indicators. They consist of a 3mm (T-1) through-hole LED within a black plastic housing. The LEDs are available in a variety of colours which are enhanced by their black packages.. Single PCB LED indicators 1 x 3mm (T-1) LED Variety of colours Black plastic housing Right angled IC compatible Wide viewing angle High reliability