Vintage Wooden Chalkboard CompassMeasures 17" longHas a rubber tip on one end to maintain the centerpoint and keep it from slipping while you are drawingout the circle or arc. The other tip holds the chalk. Both ends have a metal ring that slides down to hold the rubber tip and chalk securely in place. Also has an adjustable wing nut at the top. Note the number 34 inscribed on the back (photo 3).Would make a great addition to a chalkboard orsidewalk artists stash of tools. Feel free to contact me with questions.