The Vintage WEI'S Brass Roll-O-Ruler is a rare and unique drafting tool from the brand Wei's. This tool was used in engineering and drafting in a time when precision was essential. The roll-o-ruler is designed to measure angles and distances with accuracy, making it a valuable collectible for enthusiasts of vintage drafting tools. The original box adds to its authenticity and showcases its historical significance in the world of engineering and science.