An easy to use drawing tool that combines the functions of a parallel straightedge, protractor, T-square and compass. Draw parallel lines with ease and accuracy. Draw circles up to 16" diameter using through-holes at ½" intervals. Draw and measure angles using 1° increments. Features an aluminum roller bar for smooth-gliding action. Non-skid rubber rings for a firm grip on any surface. Durable acrylic blade with printed graduations. Three sides with 1/16" graduated edges.Individually blister-carded with detailed instructions included.