PRECISION MATH COMPASS - Designed for mathematical geometry and art drawing. Features a unique design to help prevent slipping during use. PRECISE ADJUSTMENT - Equipped with an adjustment knob for accurate geometric constructions. The compass can be locked in place to maintain settings during use. ADJUSTABLE SIZE - Draws circles with a maximum diameter of 10 inches and a minimum diameter of 1/8 inch, allowing for a variety of circular drawings. ALL-METAL CONSTRUCTION - Built with high-quality metal components for durability. Includes three spare leads for easy replacement when needed. STABILITY - Features a spring bow design with thumbwheel to help prevent unintended sliding. Color: Black Materials: Metal Package Contents: 1 * Precision Compass 2 * Spare Screws 3 * Spare Lead Note: Light and display settings may cause slight color variations between the image and the actual item. Measurement may vary by up to +/- 1-3 cm.