The Mr. Pen Geometry Compass with Mechanical Pencil Style is built for smooth control and accurate circle drawing—ideal for geometry, drafting, and everyday measuring tasks. Draws up to 5.5" circles: Creates circles with a maximum 5.5-inch diameter for a wide range of geometry and drafting work Ergonomic grip: Designed for comfort plus precise control for accurate measurements and drawings High-quality, durable materials: Built to withstand frequent use for long-lasting performance Secure transparent case: Comes with a protective carrying case for easy transport and storage Versatile for many users: Ideal for students, architects, engineers, and artists in academic or professional settings Great for circles & arcs: A reliable tool for creating precise circles and arcs whenever accuracy matters