Radius MarkersMachined from rustproof aluminum material, then anodized for lasting protection, Flange Wizard Radius Markers can lay out your smallest circles all the way to large ones up to 100" in diameter. Arms are precisely aligned with spring tension joints to guarantee accuracy and rigidity for years of continued service. The holder accommodates flat or round soap stone and pencils. Small and medium models fold to pocket size. The Extra Large model can be