Pacific Arc Professional Parallel Glider Rolling Ruler 10"

Description Can be used as a parallel straghtedge, protractor, T-square and compass. Draw circles up to 16" diameter at 1/2" intervals. Draw and measure angles in 1 degree increments. Aluminnum roller bar for smooth-gliding action. Non-skid rubber rings for a firm grip on any surface. Three sides with 1/16" graduated edges.