• 7" square has a 7" outside scale, 6" inside scale plus a 3" scale on the bottom & 1 1 / 4 " on the ends • 12" square has a 13" outside scale, 12" inside scale plus a 5" scale on the bottom & 1 3 / 8 " on the ends • Outer rule is 16ths scale and has left to right and centering rule with small drilled holes every 1 / 16 " • Inner rule is 32nds scale and has left to right rule with small drilled holes every 1 / 8 " • Angle markings and drilled holes in the center from 5° to 60° in 5° increments plus a 22.5° • Aluminum base with blue anodized finish is 1 / 2 " tall and blades off set at 1 / 4 " and 3 / 8 " and a 45° cut out • Squareness: 0.0002" per inch • Laser engraving on both sides of 2 mm blades • Sets include a mechanical pencil and lead refills • Supplied in protective box