Spring Inside Outside Divider Caliper Set is used for measuring and transferring precise measurements due to the solid nut which can adjust. They are a good tools for machinist, They are made from high quality carbon steel with hardened and finely polished points, more artistic. They have a substantially hardened spring for years of service. You will love it. One outside caliper that measures approximately 8-inch long (230 mm Leg Length) One inside caliper that measures approximately 8-inch long (230 mm Leg Length) One inside divider that measures approximately 8-inch long (230 mm Leg Length)