Material and finish Material: Aluminum alloy for durability with anodized surfaces for long life. Assembly and precision Assembly required: You have to assemble it by screwing the two pieces together. They have some clearance, which makes it possible to align them 100% when tightening the screws, for example by placing them on a flat surface. The millimeter scale and the 90 degree angle are accurate. Ease of use and measuring capability The milling cutter is easy to use. It can be used as a measuring tool. Design and compatibility Square ruler tools for carpenters: The ruler is a square design that fits most carpenter sizes and shapes. Use scenarios Quick squareness check: Place the tool on a workpiece to verify 90degree corners and ensure joints will align cleanly. Marking and measurement: Use the millimeter scale to mark precise cut lines on wood or other materials. Assembly alignment: When joining panels, leverage the built in clearance to achieve accurate alignment before tightening screws.