Calibrations are on two sides of
one edge on this high quality 1-3/4" wide (except 6", which is 3/4"
wide) aluminum ruler. This rule is designed as an efficient aid in
finding the center between two points: a significant time saving device
for crafts and design of all kinds. There is a zero point at the center
of the top edge of the ruler, with calibrations running to the left and
right of center in 32nds of the inch. The bottom edge is a standard
ruler calibrated in 16ths. Handy hang hole at one edge.