Alvin drafting T-square rulers feature 1.5" wide x 1.6mm thick aluminum blade and high-impact ABS molded head. Blade has black graduations in 16ths on both sides. Head is 9" wide and graduated in 1/16ths in white for high contrast visibility. Precision made for accuracy and longevity. Five popular lengths. Ideal t-squares for drafting, drawing, sketching, cutting, graphic arts, layout, and more.