M2x4mm wafer head screws used extensively in laptop computers and other electronics. This type of screw is used by all the major computer companies, like Acer, Apple, Asus, Compaq, Dell, HP, IBM, Gateway, Mac, Panasonic, Sony, Toshiba and others.
This size is used to hold the drive rails in slim form factor ( sff ) and laptop optical disc drives ( cd, dvd )
They are also sometimes used on laptop computers to hold the plastic pieces that cover the ram memory, modem, lan, and other cards.
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