• Starrett Yankee Calipers and Dividers are made from a high-grade steel and well-finished
• The bow spring, although flexible, is exceedingly strong to assure reliability
• All sizes are available with either spring nut or solid nut
• The Starrett quick-adjusting automatic-closing spring nut is designed for making fast, positive adjustments
• Fulcrum stud is hardened and has a smooth bearing surface
• The legs are made of flat stock and are very durable
• The threads of the nut firmly engage the screw at the slightest pressure from the leg
• When the pressure is withdrawn, the nut automatically releases itself, sliding freely over the screw

Starrett 79 Series "Yankee" Spring-Type Outside Calipers with Flat Legs and Quick-Spring Nut are made from a high-grade steel and well-finished. The legs are made of flat stock and are very durable. Calipers feature a hardened fulcrum stud, strong and flexible bow string, and centrally located leg adjustment to assure smooth action. Caliper size and capacity is 12". 12" (300mm) with Quick-Spring Nut Caliper size and capacity is 12".