Heavy Duty Center Finding Ruler Eliminates Complex Calculations

This special ruler quickly and accurately finds the exact center of circles, squares and rectangles without tedious mathematical calculations. It's easy to use . . . simply equalize the readings on each side of zero and mark the center. Each side is cleanly etched with easy-to-read conventional and centering scales. Graduations include 8ths, 16ths, 32nds and 64ths of an inch, plus markings for angles of 15, 22.5, 30, 45, 60 and 90 degrees. So, it does double-duty as a protractor, as well. Made from stainless steel plate 2 inches wide x 12 inches long x .048 inches thick with hang-up hole. A valuable tool for woodworking, graphic arts and model making.