The Groz Craftsmen’s Spring Internal Caliper is one of the finest calipers which are especially useful for craftsmen. Made from a high-grade steel, these calipers’ legs are machined to a smooth taper and coated with a black powder finish. Securing these legs are finely machined and polished nut run smoothly for a precise dimension and measurement. The fulcrum stud has a large bearing surface preventing side deflection of legs. The divider points are hardened 50-55 HRC for increased wear resistance.