Useful design Eliminates the challenges of manual measurements with symmetric arc calibration. It accounts for R-angle and C-angle requirements and minimizes setup time for consistent performance. Easy and precise to use Delivers precision without complex tools. The intuitive physical positioning keeps router edge radius templates aligned for efficient operation and reduced time and effort. Durable and finish quality Wear- and pressure-resistant construction provides reliable accuracy. Precisely machined to deliver a seamless experience with smooth edges and no sharp corners. Versatile for most tasks Facilitates smooth sanding of boards on furniture. Ideal for shaping curved corner components and enabling effortless, creative handmade projects. Compatibility and performance Designed to work with standard router edge radius templates. Built to maintain accuracy through typical use and handling. Use scenarios - Reproduce identical rounded corners on multiple cabinet panels by using symmetric arc calibration with standard router edge radius templates. - Create curved edge details on tabletops or shelves, ensuring consistent radii across parts. - Enhance craft projects such as decorative boards with smooth, rounded edges for a professional, handmade finish.