Industry-standard Alvin wooden drafting T-squares have blades made of selected hardwood to offer strength and rigidity. Durable, see-through acrylic plastic edges are elevated to prevent smudging and eliminate surface scratches. Alvin C-Series wooden T-square features a rust-proof five-screw, fixed plastic molded head with ebony black finish. Perfect for drafting, drawing, layout, and more. Available in several popular sizes. Alvin professional wood T-squares are great for schools, suitable for professionals and students alike.