[What You Get]: In this caliper set, it include 4pcs 4inch 8inch 10inch 12inch inside calipers, 4pcs 4inch 8inch 10inch 12inch outside calipers, total 8pcs well packed in a box for measuring when carving, shaping, clay sculpture, modelin. [High Quality]: All the calipers are made of stainless steel with hardened and finely polished points, strong and durable for long time service. Applying anti-rust oil to prevent rust. [Inside/Outside Caliper]: Inside calipers measure hole diameters and distances between surfaces; Outside calipers measure thicknesses and outside diameters of objects. [Product Feature]: Our calipers are and easy to handle calipers transfer measurements from model to clay for both inside and outside dimensions. Firm joint calipers use friction at the joint to hold the legs not move. [Pratical Calipers]: Great to measure the external and internal size which ordinary calipers can not reach, such as sculpture, pottery, tube and so on. Please notice that it will be a little hard to open them for first use, the oil on the calipers will lubricate once opened. Colour: silver Material: stainless steel Package Contents: 4 * internal calipers (150mm 200mm 250mm 300mm) 4 * external calipers (150mm 200mm 250mm 300mm) Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.