- Durable and reliable construction. The circle ruler is made from high quality aluminum alloy with an anodized finish. It is wear-resistant and corrosion-resistant, providing a sturdy, durable tool with stable, reliable performance for long-term use. - Easy disassembly and customization. A brass nut allows quick disassembly and replacement of parts. Release the nut to swap components to meet different drawing tasks quickly and simply. - Draw lines with ease. Designed to guide straight lines by resting along the edge of a wooden board, delivering precise, easy-to-read lines. - Draw circles with confidence. Mark the center on the wooden board and align the thimble with the crosshairs to draw circles of varying sizes, from a 12 mm to a 290 mm radius. - Versatile practical use. Ideal for woodworking and carpentry projects, such as laying out cabinet outlines, shelves, or joinery lines; useful for creating circular templates or cutouts on wooden surfaces; and suitable for drafting or layout work on plywood or drawing boards.