3mm dia, hole for LED light pipe. Case height here should match one of the available light pipe heights: 5.1, 6.4, 7.6, 8.9, 10.2, 11.4, 12.7, 13.9, 15.2, 16.3, 16.5mm (PCB to outside of case) 10mm clearance above PCB. Includes Molex connectors, power socket and supercap All other areas have 2mm clearance above PCB. 4mm clearance above PCB. Includes power supply parts, USB connector and base of light pipe There is a 1mm width around the PCB edge with no components where the case can clamp the board in place, except on the top side where connectors are