Using solid brass as the material, these sliding calipers are well-made, practical, strong and hard, finely crafted, anti-deformation, anti-fading and rust, non-magnetic, shiny and shiny, full of retro atmosphere, can serve you for a long time. This jewelry caliper measuring tool has clear proportions, high precision and reliability, making it easier for you to get accurate measurement readings; in addition, it is lightweight and mini, allowing you to carry it in a bag or pocket without taking up too much space These vernier calipers feature a dual scale design with millimeter and inch scales, saving you time for quick measurements and great convenience for your work There are 4 mini caliper measuring tools in the package, each with a total length of about 10 cm / 4 inches, 3.5 cm / 1.38 inches wide, with a jaw of about 21 mm and a weight of about 42 g / 1.48 oz. The practical measuring tools can meet your daily needs The buttons on these pocket rulers allow you to push and pull the ruler easily, and are ideal for measuring the inner or outer diameters of wood beads, glass beads, rings, gems, jewelry and other items. Colour:As Shown Material:brass Package Contents: 4 * pocket caliper Only the above package content, other products are not included. Note: Light reflection 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.