Du-All Art & Drafting Supply

Zero-point in center of rule with increments to left and right. Allows quick location of center between any two points. Especially useful in picture matting, forms creation and for locating button holes and pleats in pattern making. Faster than using dividers and eliminates guesswork. Bottom edge is a standard rule. Calibrated two edges, one side.
Length x Width Calibrations
23-148 48" x 1-3/4" 16ths, 32nds RC48.