Westward Measuring Drywall T-Square 13P537 Drywall squares, also known as drywall T-squares, are essential tools for scoring and cutting drywall, plasterboard, and similar materials. Unlike drafting T-squares, they're built to handle the rigors of construction. Their key feature is a sturdy crossbar head that allows them to be held firmly against the edge of the material, ensuring clean, straight cuts. Drywall squares are typically larger than drafting squares to accommodate wider sheets of material. System of Measurement / Inch Base Length / 22-inch Base Width / 1-1/2 inch Blade Length / 48-inch Blade Width / 2-inch Thickness / 0.12-inch Graduation Marks (Base) / 1 mm Graduation Marks (Blade) / 1 mm Graduation Mark Style / Printed Graduation Color / Silver Numeric Marks / Centimeters Edge Style / Square Features / 5-Rivet Construction Coating / Anti-Rust Finish / Anodized Squareness Tolerance / ± 0.005 mm Straightness Tolerance / ± 0.005 mm Square Color / Silver Blade Material / Aluminum Base Material / Aluminum