[What You Get]: This caliper set includes 4 inside calipers (4 inch, 8 inch, 10 inch, 12 inch), 4 outside calipers (4 inch, 8 inch, 10 inch, 12 inch), for a total of 8 pieces. All calipers are well packed in a box and suitable for measuring during carving, shaping, clay sculpture, and modeling. [High Quality]: Made of stainless steel with hardened and finely polished tips, these calipers are durable and built for long-term use. Anti-rust oil is applied to help prevent corrosion. [Inside/Outside Caliper]: Inside calipers are used to measure hole diameters and distances between surfaces. Outside calipers measure the thickness and external diameters of objects. [Product Feature]: These calipers are easy to handle and allow measurement transfer from model to clay for both internal and external dimensions. The firm joint design uses friction to hold the legs securely in place. [Practical Calipers]: Ideal for measuring internal and external dimensions in hard-to-reach areas where standard calipers may not fit, such as sculptures, pottery, and tubes. Please note that the calipers may be slightly stiff during initial use; the applied oil will provide lubrication after repeated opening and closing. Color: 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 is included; other items are not part of this set. Note: Lighting and display differences may cause slight color variations between the product and the image. Measurement error allowance is +/- 1–3 cm.