Starrett 274 Series Toolmakers' Spring-Type Calipers and Dividers with Round Legs and Solid Nut are the finest tools of their type. Designed for toolmakers and all good mechanics who require finer adjustment and better balance so a more sensitive "feel" can be obtained. Precision made to rigid Starrett standards throughout. Features include hardened fulcrum stud, strong and flexible bow string, and centrally located leg adjustment to assure smooth action. 6" (150mm), Inside Caliper.