Toolmaker's "Yankee" Spring Inside Calipers ID Dividers, Solid Nut, 0-6.5" / 165 mm Range, Fine Adjustment Mechanism, Flat Leg, C2-6

Inside spring calipers are used for measuring and transferring precise inside (ID) measurements. These calipers are made from high-grade carbon steel with hardened, rounded and finely polished points. They feature a solid nut for precise fine adjustments that will securely hold any measurement. Adjustment mechanism is central located to assure smooth action. "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.