Lufkin® 646LN Red End® Masonry Wood Rule, 5/8" x 6'All sections have square ends. Every joint opens on even number. Inside marked with 6 scales in a 16" module. Outside is graduated on both edges to 1 16ths. The first end section is a short section. Permits butting the rule on the first 16" module. 5 8" x 6' Inside marked with 6 scales in a 16" module Outside is graduated on both edges to 1 16ths All sections have square ends Every joint opens on even number The first end section is a short section