Unique 4-in-1 drawing compass/ruler. Draw circles, triangles and straight lines. Construct, COPY and read angles. Measure/convert inches and centimeters. Create patterns. Focus on Skills: Draw, measure and copy geometric constructions, Spatial sense and awareness, Comparison of inches and centimeters. To use: Slide cursor to desired position and lock; place finger on the transparent, swivel disc; place pencil point in one of the cursor holes and draw a circle. Inch markings to 4-1/2" (11 cm).