Draw Any Size Circle with Our Yardstick/Ruler Compass Trammel points system for ruler, yardstick or similar rod/staff Scribes arcs and circles up to 72" dia using standard yardstick Aluminum posts with screw tops Stainless steel point and replaceable lead pencil tip 3-1/2" long Slip these trammel points on any standard size yardstick or ruler. Draw arcs and circles up to 72 inches dia. Use a longer stick the same width and thickness as a yardstick and draw circles as large as you like. Compass is equipped with screw top to tighten or loosen onto yardstick. Can be used with standard 12" ruler, as well. Aluminum posts. Steel point. Replaceable lead pencil tip. 3-1/2 inches long. Great for laying out model railroad curves, and on paper, cardstock, etc. Made in the USA! Fits yardsticks and rulers from 1-1/8" to 1-1/4" wide. YARDSTICK/RULER NOT INCLUDED.
