7' standout. Easy readability with 1" wide blade. Entire blade coated with Mylar polyester film for added durability. Heat-treated spring stands up to repeated use. 16" and 19.2" stud center markings simplify framing jobs. Three-rivet, corrosion-resistant hook moves for accurate inside/outside measurements. Secure blade lock wont creep during measurements. Special Tru-Zero hook does double-duty as a pivot for drawing circles and arcs. Mylar is a registered trademark of DuPont Teijin Films for its polyester film. Only Dupont Teijin Films makes Mlyar polyester film.