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U-Ruler is a new protective tool.
People usually cut papers with one hand holding down the ruler,
and holding a knife cut on another hand. Some iccident often
occured because the ruler is so thin that the knife always away
from the original track.
Now, we design a U-shaped slot in the 1 / 3 part of the ruler.
The groove width is common for the width of the blade to go
through.There is a slightly protruding in the middle of the ruler,
and both sides of the protruding blade can maintain a vertical
relationship with the paper.The knife will be fixed along the
path when you are cutting papers rather than breaking your hand.
Zhen Zhang Ziyi Yuan