Dividers are used for measuring and transferring precise distances between two points and for drawing arcs and circles. These dividers are made from high-grade carbon steel with hardened and finely ground points. They feature a quick-spring nut for Rapid and precise fine adjustments that will securely hold any measurement. Adjustment mechanism is Central located to assure smooth action. Fulcrum and adjustment mechanism are brass. “Yankee” style flat-leg construction makes unit very durable. They have a substantially hardened spring for years of service. Maximum opening is 6. 5 inches or 165 mm.