Product Description Johnson's 16" x 24" rafter square is everything a builder needs to get the work done quickly, efficiently and accurately. It includes graduations in 1/8", 1/10", 1/12" and 1/16" as well as octagon scales, rafter tables, brace tables and board foot tables, making it useful for any number of different jobs. And those graduations and tables are permanently stamped so you'll never worry about them fading or wearing. This rafter square's aluminum construction makes it conveniently lightweight while also keeping the tool safe from rust. From the Manufacturer Permanent 1/8 In. stamped graduations include rafter and Essex Board Measure tables. Clear (silver) anodized finish. VERSATILE RULER: This Construction Square includes stamped graduations and numbers with rafter tables; and board foot tables for versatility. It comes in heavy-duty steel; with rafter and Essex board measures. DURABLE DESIGN: The 16" x 24" steel square frame has an adjustable stainless steel blade with an urethane coating that resists corrosion and rust for durability. It withstands the abuse of carpenters and construction workers in the workplace. EASY TO READ: This square ruler features permanently etched EZ Read graduations and numbers in black for clear visibility. There are 1/8 "; 1/10"; 1/12 "; 1/16" graduations and numbers. APPLICATION RANGE: This measurement ruler is ideal for all carpenters and builders. It is perfect for use in frames; rafters; stair work; layout; right angle search; and setting; marking of cutoff work; etc. PRODUCT SPECIFICATIONS: This carpenter L framing square has a 24" x 2" body; 16" x 1-1/2" tongue; 1/8" thick. It weighs 8 ounces (0.3 kg) approximately.