Folding Rule, Extension, 1/16ths, 6 ft Lg, Regular Outside Marking, Wood, Imperial, 5/8 in Wd

Graduated slide rule extends up to 6 in, Slide rule runs under friction in T-slot and stops at each end to prevent slide from falling out, Marked both sides and both edges, Graduated to 1/16ths of an in, 16 in stud centers in red, regular outside markings, Boxed packaging.