The file 'Arduino UNO R3 Enclosure 3D Printer Model' is (stl) file type, size is 921.83 KB.
Enclosure for Arduino Uno Rev 3. Two parts, base and cap. Put Arduino uno on base, Clip cap on the base.
PS : Work great without screws but you could fix the pcb with 4 screws M3 on the base (not tested)