It does not include UNO R3 board and bread board for arduino board with all the same mounting holes.   
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!