Designed with a fiberglass ring head and pivot design for smooth, firm adjustment. Split leg design that accepts interchangeable pen, pencil and divider parts. Slip handle for spare ruling pen. Accurate center wheel adjusts quickly and easily for circles up to 10" dia. Built-in spindle stop prevents over extension. Matte nickel finish resists stains and tarnishing.
Circle Diameter Max: 10" (20" with beam bar extension)
Includes extra lead, needle point, bolt and beam bar extension.