Made with non-abrasive material that will not scratch glass. Theses squares are perfect for accurately cutting pieces of glass up to 18" wide. Measures 18 inches long by 10" wide (with a 1-1/2" space between the 1" mark which includes the lip and the first inch). Ruled on both sides. Inches on one side and centimeters on the other. One end has a special lip to hold glass for perfectly straight cuts.
Shipped in a padded envelope.