The Mr. Pen Professional Metal Compass with Wheel and Lock for Geometry is built for precision work across math, geometry, art, drafting, and drawing—especially when you need consistent, larger circles.

• Creates circles up to 18 inches: Includes a universal adapter and extension beam for bigger circle work
• Spring bow head + center wheel: Designed for precise control and stable performance
• Quick-setting adjustment: Push-button adjustment helps you set measurements faster
• Helps prevent slips: Mechanism helps prevent unintentional leg movements
• Premium quality: Built for reliable, repeatable results
• Included accessories: 10 extra leads, spare needle, screws, and a screwdriver
• Easy to store and carry: Packaged in a clear, reusable pouch