Optional set of 2 x 5mm M2 black case bolts, 2 x M2 knurled brass screw mounts, and a 1mm hex key for the 1-bit rainbow pico-mac-nano implementation of the open source pico-mac project. Although the pico-mac-nano case should fit together quite snuggly, it was designed to reflect the design of the original Macintosh with two bolts within the handle recess. The brass nuts heat/press fit into holes on the front case.