characteristic: Woodworking combination calipers are made of solid aluminum alloy, which is durable and can easily measure the length of lines. Smooth and delicate surface, accurate scale, small size and easy to carry. You can easily draw lines of 45 degrees and 90 degrees. Just depress the spring-loaded index pin & lock the head at any full inch, now your scribing guides are dialed in and ready for accurate parallel marking. The squares have a firm footing when standing vertical for cabinet checks or machinery adjustment, The guides are size to capture a pencil tip for highly accurate parallel scribing. describe Name: Woodworking Combination Caliper Material: Aluminum alloy colour: silver+red Package Contents: 1 x Combined 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.