7-3/4" sides x 11" (19.69 cm x 27.94 cm) hypotenuse Inscribed with contrast-enhancing colors (black and red) for easy readability Mounted pencil holder acts as a handle for easy maneuverability Use two triangles to transfer a directional line on a chart Protractor scale allows easy alignment with chart median in any direction 90 degree angle helps determine lines of position Limited Lifetime Warranty