ITEM NAME:Harden Steel Right Degree Angle Try Square Ruler, Measuring Layout Drawing Tool img *{margin:0;padding:0;.Harden Steel L Shaped 90 Degree Angle Try Square Ruler. 1 Piece Try Square Ruler. Great for making perfect corners, centering stone, layout drawing tool and many other uses. Made of polished hardened steel, high precision angle, highly accurate for set-up.