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There is a slightly larger opening at one end of the ruler,makes it easy to pick up the ruler.
Generally, all the parts of a ruler is straight,makes it more difficult to grab or pick up it.Especially,when someone just finished cut her or his fingenails, this kind of situation is more difficult.So if there is a slightly larger opening at one end of theruler,we could grab or pick up it more easily,even if theone who just finished cut her or his fingenails.