This is used to weave at a uniform width. Normal Weaving Temple are made with the bamboo section attached to the front, but in Kyoto (Nishijin) Weaving Temple are made with the bamboo attached to the backside. The reason for this is that when the bamboo is attached to the back it will always revert to its original straight position and provide an unchanging unit of measurement rather than bending over time. The needle is especially thin and will not puncture big holes in the cloth.

[Kujira Units]       1shaku = 37.85cm       1sun = 3.785cm       1bu = 0.3785cm