This Speed-Up Geometry Ruler is a drafting instrument manufactured in the 1950s by the Speed-Up Geometry Ruler Co. of Baltimore. The device combines the functions of a ruler, protractor, and stencil set into a single unit constructed of flexible vinyl plastic. It facilitates the creation of angles, the bisection of lines, and the drafting of geometric shapes including right triangles, hexagons, octagons, pentagons, rhombuses, and irregular polygons via integrated stencil cutouts. This tool can be applied in educational settings for the study of geometry and in professional contexts for drafting purposes. An instructional booklet accompanies the ruler, providing instructions and examples for its use. The booklet exhibits age-related discoloration. This item represents an example of drafting technology and mathematical instruction from the mid-20th century.