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The Ring Ruler™ is the first size-adjustable, circular ruler. It has been designed to make the drawing and measuring of circles and arcs a much simpler and more efficient experience by eliminating the cumbersome pivot-point system. Not only is the natural feel of expanding and contracting a circular ruler more ergonomic than using a needle compass, it is also quicker, safer and provides more the useful circular metrics of diameter and circumference (arc length).
Posted by Brian on 23rd Jul 2013
i am very happy with this ruler. Have never seen one like it before. will be great for doing not only the skull but helmets. thanks for something unique i can use.
Posted by Matt on 24th Jun 2013
Fantastic, secure, accurate item robust enough for any application where circles or arc's are required