Made from a durable aluminum alloy for lightweight strength. Radius options and reach: - Circle marking tool radius: 36.5 mm - Circle radius: 300 mm - Extended circle ruler radius: 550 mm - Adjustable radii let you measure or draw arcs and circles in different sizes to fit your needs Easy to use: - All you do is remove the screws, fix the woodworking compass, and then adjust the radius size - The radius can be changed as required to meet various marking tasks, saving time on setup and layout Extended circle marking tool: - The extended tool improves handling and accuracy, making your work more convenient Applications: - Mark arcs and circles on panels, cabinetry, and furniture components - Create circular templates for hinges, dowels, or template routing - Lay out decorative curves or curved grooves on wood pieces