The Ibex Fret Scale Rule is an easy way to mark the fret positions and saddle position. The double-sided etched stainless steel ruler has the 4 scale lengths with nut and saddle positions on one side, the other side is a standard 700mm ruler in inches and mm. - Made in USA - Stainless Steel - Double-sided - 700mm Standard rule on reverse side 4 scale lengths -

- 24 27/32" (631mm) -

25 11/32" (643.7mm) - commonly used on Martin guitars but called 25.4"

-25 21/32" (651.7mm) -

26 1/8" (663.6mm) - a long scale sometimes used on concert classical guitars