Alvin PGS24 Premium Safe-T-Cut 24" safety ruler cutting straightedge is constructed of durable, heavy-duty, lightweight aluminum. Engineered with a curved protective angled profile to shield fingers from cutting blade during use. Inlaid STAINLESS STEEL CUTTING EDGE will not nick from your knife blade. Also features an extra-wide 3.25" non-skid, non-slip black backing for comfort, stability, safety, and accuracy. Graduations printed in black on white for high contrast. Both Metric (centimeters and millimeters) and English (1/16") measurements. Includes a hanging ring on one end for convenient storage. Lifetime guarantee under normal use in studios, shops, framing departments, schools, industrial applications, etc. Trim safely, trim fast, trim straight while protecting those fingers and hands with the 24" Premium Alvin Safe-T-Cut safety straightedge.