CR-18 Centering Rule

Made from a unique steel, this ruler is fully flexible, making it as
much a drafting aid as a ruler. Combine this material with centering
graduations and you have a tool which saves you time and reduces the
chance of error. The CR-18 Centering Rule completely removes
the mathematics from all sorts of centering tasks. It is particularly
suited for centering or laying out on curved surfaces such as chair backs.
It also works great for drawer pulls, and a host of non-shop chores
such as photography, weaving, quilting, etc. The CR-18 Centering Rule is a must for serious craftspeople.