Made of stainless steel and assembled with polished and rust-free hardwares, sturdy, high hardness, strong, and , smooth surface and edges without any burr. Inside caliper is available in the same size range as outside caliper. Firm joint calipers use friction at the joint to hold the legs not move. Features - Color: Silver. - Material: Steel. - Size: 20.00X1.50X0.50cm/7.86X0.59X0.20in. - Steel material made calipers with hardened and finely polished points, strong and . - Inside calipers measure hole diameters and distances between surfaces. - Outside calipers measure thicknesses and outside diameters of objects. - Calipers are lightweight and easy to handle calipers transfer measurements from model to clay for both inside and outside dimensions. - Great for measuring the external and internal size which ordinary calipers can not reach, such as sculpture, pottery, tube. Package list: 2 x Calipers