STURDY & ACCURACY. 180 degree protractor semicircular 6" ruler protractors feature pivoting arm for better measure for any angle. Clear color allow see the words, letters on page through the protractor BRELLIENT DESIGN. Scale-arm, easy grip top control with two-sided 6-inch / 15-centimeter measuring. Metal point makes circles up to 12" in diameter. IDEAL DRAFTING. Includes 3 1/2 #2 HB golf pencil with secure lock allows quick adjustment as needed. Great for drawing arcs, circles, divide gauges, dividing line, line segments,Size measurement. PERFECT ANGLES. Easy draw and adjust legs. Perfect for precise drawings. Trace and draw the perfect angle, circumferences, graphing, and design with our easy-to-use compasses. MULTIPURPOSE. Excellent for use in school, office, studio, or at home. The best circle drawing tool for student, artist, mathematician, carpenter, engineers, architecture, and designer