It does not include UNO R3 board and bread board for ard board with all the same mounting holes.
Invoice: transparent substrate 1pc, nylon column 4pcs, nylon nut 3pcs, nylon screws 4pcs, silicone mat 4pcs
Size: 12CM * 8.3CM
Note: When the motherboard is installed near the SDA, SCL pin nylon pillars are unable fixing screws or nuts, please do not think that is a design issue!