PRO SERIES COMPASS - Create precise circles with this steel compass for geometry. Use it as a drafting compass, or as a drawing compass to bring your ideas to life. IMMEDIATELY START CREATING - Compass with high quality ruling pen. Circle drawing tool with lock for exact shapes. Includes ruling pen for making precise lines. VERSATILE COMPASS WITH RULING PEN- Use this compass as a math compass, geometry compass, or carpenter compass. Our metal compass is designed for professionals and to last you years.