Function: The compass can be used for repeated measurements or for drawing arcs and circles, suitable for woodworking. Durable material: The ruler for woodworking is made of aluminum alloy, resistant to corrosion and durable. Adjustable radius: the drawing distance of the tool is adjustable. You can adjust the distance you need. Application: This wood marking gauge can be used as a professional carpenter compass for woodworking, decorative design, industrial drawing, metal processing or products in leather. Easy to use: Attach the round pen perpendicular to the center line and fix it on a wooden board for use. The stationary pen can be stored at the end of the main body, so that you can take it as you go. Specifications: Material: aluminum alloy. Dimensions: 164 x 30 x 15 mm. Scope: woodworking, decorative design, industrial design. Note: The color of the actual item may vary from the photo, depending on the your computer's display and brightness settings. Thank you! Since measurements are taken by hand, the sizes shown may vary from 1 to 2 cm.