FLATWORKING READY: Make flat work a breeze. Our award-winning, patented swing fence easily rotates 90 or 180 degrees for precise flat work. This is ideal for carpenters, metal workers, and floor workers. Ergonomic, versatile, and left-hand friendly. Opens up new dimensions of possibilities and makes your job easier. AIRLINE ALUMINUM: Durable 0.25" anodized T6 extruded aluminum. Never cast aluminum: We don't use recycled soda can material like many tool manufacturers. This is a premium CNC milled and hand assembled construction tool. Built to last. QUICK REPEAT MARKING: Turn your rafter square into a jig with our exclusive jig block and thumb screws. Set the jig to any mark and lock it in place. Reliable, repeatable marking and cutting saves time and improves accuracy on the job site. Built-in level quick-read vial provides three readings at once: horizontal, vertical, and 45 degrees. Place it on the header for a fast reading. Manually verify measurements. Leave your torpedo level in the truck. HIGH CONTRAST MARKINGS: High visibility, crisp resolution, precision etched markings. Speed is money. Finally, fully laid out fences for improved efficiency.