Kingbright 5mm Single-Level LED Indicators - Single Block. These single level PCB LED indicators, from Kingbright, consist of a 5mm (T-1 3/4) through-hole LED within a black plastic housing. The housings hold the LED at a right angle to the board whilst providing a high contrast ratio to the LED. The LED indicators are available in a variety of single colour and bi colour options.. Features of the single level PCB LED indicators: 5mm through hole LED Black plastic housing Right angle Variety of colours