Safety Ruler 18" Safe-T-Cut Cutting Straightedges by Alvin, Available in sizes 12" thru 72" Safety Ruler - Safety ruler the Alvin Safe-T-Cut Straightedges are available in sizes ranging from 12 inches to 72 inches. These safety rulers are graduated in inches and centimeters. The safety ruler straightedge is designed with a vertical protective guard that ensures safety of fingers and hands while cutting. The safety ruler’s straightedge is suitable for use with hobby knives, craft knives, utility knives, rotary knives, and more. The safety ruler straightedge is made of a hardened aluminum ideal for safely cutting paper, vinyl, plastic, foamboard, gatorboard, leather, etc. The safety ruler straightedges are graduated to the 1/16” and in metric to 1mm. The safety ruler straightedge has an extra wide 3 1/2" non skid base with rubber backing to prevent slipping and accidental cuts. Convenient hanging ring keeps the Safe-T-Cut Cutting Straightedge within easy reach. Choose the size you need 12” through 72” graduated safety ruler.