Stanley 45-011 Contractor Grade Aluminum Rafter Square Extra-thick aircraft-grade aluminum maximizes durability and maintains accurate square Individually inspected for accuracy Embossed graduations are painted yellow for readability in all light conditions Markings include brace measures, octagon scale, board measures and rafter table Surface treated to resist corrosion and extend the life Contractor grade aluminum rafter square is an easy-to-use measuring tool built to last Markings conveniently include brace measures, octagon scale, board measures and rafter table Built with extra thick aircraft grade aluminum; surface treated to resist corrosion; black lacquered finish Deep graduations and numbers filled with yellow paint for superior readability Body: 24- by 2-inches; tongue: 16- by 1-1/2-inches; backed by lifetime limited warranty