The Alvin Safe-T-Cut Graduated Cutting Straightedge Ruler is designed with a unique vertical protective guard that ensures safe, accurate cutting. These hardened aluminum straightedges are ideal for studio, shop, or classroom use. Precision ruling edge is graduated in inches (divided 1/16") and centimeters (divided 1mm) for easier than ever trimming jobs. Extra wide 3½;" base has non-skid rubber backing to prevent slipping and accidental cuts. Convenient hanging ring keeps the Safe-T-Cut within easy reach.