The carpenter's ruler is carved by laser, which has a clear metric scale and can realize accurate and easy-to-read scale. Ruler has the functions of measuring, correcting and marking, and can be used for more than one foot, which can effectively improve woodworking efficiency and save time. This woodworking square protractor is made of high quality aluminum alloy. It is rust-proof, high in hardness, good in toughness, light in weight, easy to carry and can be used for a long time. The multi-angle measuring ruler is detachable. When you screw on the screw, the carpenter's ruler becomes a 3D measuring tool. When you don't need it, use a hexagon wrench to remove the screws, and you can get a square ruler and a miter triangle ruler. Multi-angle measuring tool suitable for , engineers, DIY enthusiasts, decorators and construction workers. describe: Name: Multi-angle metric woodworking ruler combination set TIP: With the words "Drawing Line ruler" Material: Aluminum alloy colour: Blue Package Contents: 1 x Woodworking ruler combination suit 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.