The aluminum ruler sliding block has a 45-degree slider, which allows you to easily draw angle lines of 45, 90 and 135 degrees. It is accurate and easy to use. It is the best woodworking tool and accessories. Made of high-quality aluminum alloy and CNC technology. The surface of ruler is anodized, which is wear-resistant, rust-proof and durable. It is compact and easy to carry, and can also be hung for easy storage. Mainly used for making edge marks and repeatability, because the slider is firmly locked by two knurling knobs. When you need vertical measurement, slide the baffle from and insert the cutting blade. Now your rules have a perfect position to stay upright. The scale is more accurate, the mark is clearer, and it is easy to read. The smooth black surface has a sharp scale, and the accurate mark can perform well on any blueprint or surface. Name:Woodworking Ruler Quantity:3pcs Colour:Red Material:Aluminum alloy Size:16cm/20cm/30cm Package Contents: 3 * Woodworking 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.