Retro sturdy: Made of solid brass as material, these sliding calipers are well made, strong and hard, well made, resistant to deformation, fading and rust, non-magnetic, shiny and full of 'retro atmosphere High precision and easy to carry: The scale of this jewelry caliper measuring tool is clear, high precision, accurate and reliable, allowing you to obtain the data measuring accurately; besides, it is lightweight and compact, you can carry it in your bag or pocket, will not take up much spaceSize Details: 1 x mini caliper measuring tool, each tool has a total length of about 10cm, a width of 3.5cm, and a jaw of about 21mm, a practical measuring tool that can meet your daily needs . Perfect for measuring jewelry: The buttons on these pocket rulers allow you to easily push and pull the ruler and are ideal for measuring the inner diameter of wooden beads, glass beads, rings , gemstones, jewelry and other items.