These often fit into the brass motherboard stand-offs that come with PC cases (and are readily available online) so it makes for a cheap and easy way to securely mount the Pi. Just to add to the already correct answers, there's enough leeway to enlarge the PCB holes to M3 size so that you can use standard PC floppy drive screws, of which any PC enthusiast is likely to have a surplus. These models all share the 2.75 mm (or 2.7 mm respectively) holes. They show the size and position of the holes as well as board outline and position of connector. has now mechanical drawings for the Pi 4B, Pi 3B+, Pi 3B, Pi 3A+, the Zero (v1.2), the Zero W, Pi 1B+, Pi A+ available. Pi 1 A shares the board layout with the Pi 1 B (suggested by TomG and supported by available pictures). Pi 1 B (rev 1) does not have any mounting holes. See also that describes the existance of drilled holes of 2.9 mm diameter for M2.5 screws. Pi 1 B (rev 2) contains two M2.5 mounting holes (as derived from own measurements, diameter is roughly 2.8 mm). This information is taken from the "Raspberry Pi B+ Mechanical Schematic" (official drawing by J. Pi 1 B+ contains four M2.5 mounting holes - supposedly drilled to 2.75 +/- 0.05 mm. Tl dr: Those models that have holes in the PCB are made for M2.5 (or UNC 3-48) screws and a length fitting to the enclosure or respective counterpart.
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