This 24" aluminum rafter square boasts contractor-grade quality. Features include extra-thick aircraft-grade aluminum construction, black-laquered finish for corrosion resistance, embossed yellow graduations and numbers for superior readability. Rafter tables, brace measure, octagon scale, and board measure provided. Body measures 24" x 2"; tongue measures 16" x 1-1/2". Face is graduated in 1/16" and 1/8" increments; back is graduated in 1/16", 1/10" and 1/12" increments. Lifetime MW. Black. Made in USA. Home Improvement,Tools,Hand Tools