This is a file, commonly a rasp, but it could be a mill file or a bastard file, that is rounded on one side and flat on the other side.
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A half round file is good for work with any wooden project sand round corners
The standard is to round a half upwards.
Not really because a semi-circle is a half-circle so only half of it is completley round.
If the fraction is less than half, round down. If the fraction is half or greater, round up.
4.5 already is rounded to the nearest half.