These were designed to do one perfect 1/4" echo but they have so many uses. This is a versatile tool and comes in many sizes. The numbers are based on a circle.... so the ProEcho 4... the curve comes from a 4" circle. You can use them for spines, continuous curves, curved crosshatcing, block designs... anywhere that you need a curve.
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Rilers are well marked.
Jan · January 20, 2026
Super fast shipping! Beautiful week though out ruler design.