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To Prevent components on the back of the motherboard from touching the case.
Usually, when you buy a computer case it comes with standoffs which get screwed on to the case (there's usually at least 6 and as many as 10) and then the motherboard sits on those standoffs instead of on to the case itself. The motherboard standoffs serve the purpose of avoiding direct contact between the motherboard and the case itself so as to avoid a possible electrical discharge which would in turn damage the motherboard. There are holes on the case where the standoffs should be placed.
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Spacers.
the tablet pc is more portible then an average pc
Fatherhood - 2014 Standoffs and Tantrums 1-2 was released on: USA: 17 January 2014
Standoffs, Also called spacers, are round plastic or metal pegs that separate the motherboard from the case, so that components on the back of the motherboard do not touch the case.
Two packages are housed in carrying case assembly and two are housed in the carrying harness; each package contains six standoffs
standoffs
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Standoffs help to keep the motherboard from touching the case. If that were to happen, that could cause an electrical short and possibly damage the motherboard. Standoffs can also allow for air flow under the motherboard. Another thing of note is that they raise the board to the proper height so the peripheral cards and any connections on the back are in their proper places.
The standoffs create a space between the case and the motherboard, so preventing shorting of components. The space also aids cooling air flow through the space.