6 Ft. Folding Rule

Spring joint wood rule with graduated slide that extends up to full 6'. Slide runs under friction in T-slot and has a stop at each end so slide will not fall out. . Marked both sides and both edges to 1/16ths of an inch, 16" stud centers in red, regular out side markings. Numbering begins on inside of rule; measurement lies close to the work. To take an inside measurement; open rule to within 6" or less of the distance. Butt square end against one side of opening. Extend slide until it strikes other side. Ad d measurement on slide to that shown at other end of rule for an exact measure of the opening.