1.[Features]- Package included 6 inch outside caliper, 6 inch inside caliper and 6 inch divider. The feet are made of flat material and are extremely durable. The fulcrum column is hardened and has a smooth bearing surface. The bow spring not only has good elasticity, but also is very stiff, which can ensure the reliability of the tool. 2.[Material]- Caliper set is made from high-grade carbon steel with hardened and finely polished points. Wear-resistant, not easy to rust and durable. 3.[Special Design]- The caliper is designed with a quick adjustment nut, and the spacing is adjusted by a quick nut, which is simple to fix and easy to operate. 4.[Application]- Outside caliper is used for measuring round stock or oddly shaped materials and then transferring that measurement to a ruler. Inside caliper is suitable for gauging the inner diameter of an opening and then transferring that measurement to a ruler. Flat leg divider is a useful measurement transfer tool for uneven surfaces, tracing contours, and scribing circles into metal.