Square up with this precision measuring tool. Heavy-duty machined head guarantees accurate angle orientation to within 0.001 inches. True Blue® level vial provides superior readability and fade-, fog- and leak-proof durability. Permanently etched stainless steel blade features both a front-on and reverse-angle orientation, ensuring quick and easy reading. Self-aligning drawbolt simplifies blade attachment and removal. Base-mounted, hardened scriber allows you to mark work surfaces without having to stop and search for additional tools. Square Type: Combination; Blade Length: 16".