Product Material:This ruler is made of high-quality aluminum alloy material, and the surface has been anodized, making it harder and wear-resistant, with good insulation performance and long service life. Product Features:The arrow ruler is precision machined by CNC and has high-precision scales. It can be used as a woodworking measuring tool and square ruler. It is simple to operate and has common functions for woodworking such as length measurement, 45/90 degree angle measurement, correction, marking the center of a circle and the center line of a circle. Versatile Application:Suitable for DIYers, engineers, carpenters, and decorators. It is an essential measuring tool for workers in the wood industry. It is suitable for round materials, three-dimensional workpieces, square wood, pipes, etc. If someone around you is keen on DIY, this multifunctional arrow measuring ruler will be the best gift. Please note: the physical slightly color difference or difference, does not affect the use, please do not mind, thank you! Material: Aluminum alloy colour: black Package Contents: 1 x line drawing ruler 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.