describe: PREMIUM MATERIAL: The multi-angle measuring ruler is made of high-quality 5mm aluminum alloy, equipped with durable metal knobs and bolts, and is coated with a black oxide layer. The six-fold measuring tool is rust-proof and will not rust. This universal square ruler is stronger and more durable than plastic rulers. With normal storage, it can last a long time in your toolbox. Easy to use: Angle ruler has six pieces of ruler and metal knob with 3 positioning holes. You can adjust the six metal knobs to the shape you need, then lock it, and then install the ruler on the material that needs to be cut, quickly draw the dimensions and cut, which saves you time and improves your work and productivity. Laser engraving: This angle measuring instrument uses special laser engraving technology for scale. It is very wear-resistant and can be used for a long time without worrying about corrosion. Available in both metric and imperial displays, it is ideal for precise angle measurements. Other rulers were different. , they will not wear out and disappear due to using the scales for too long, the digital scales will stay on the ruler forever. Easy to carry: The six-fold angle measuring ruler is an excellent portable tool, easy to fold, save space, and easy to store, you can even put them in your clothes pocket and carry them with you at any time, or put them in your belongings. In the backpack, a small pocket can hold them. MULTIPLE USES: Super handy precision tool makes difficult tasks easier, multi-angle aluminum measuring ruler universal layout tool makes it easy to create bullseyes, arches, vertical cuts and any project you can think of, perfect for woodworking, Brick, tile, wood, glass, stone, laminate, construction and engineering projects and more! It's the ideal formwork tool for carpenters, bricklayers, craftsmen, handymen and DIYers. Package contents: 1 piece hole opening locator