characteristic: Woodworking combination calipers are made of solid aluminum alloy, which is and can easily measure the length of lines. Smooth and delicate , 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.