Ludwig precision's heavy duty T-squares feature a broad 2 inch by 2.3 millimeter thick blade which is ideal for large cutting projects and drafting Boards. Made from high-quality extruded aluminum. These broad T-squares also offer a 14 inch wide, solid black plastic head and is calibrated to 5 inches on each side of the blade. Calibrated in both inches and centimeters. 48 inches in length.