Self-sharpening hardened steel blades, 0.5" grid, and dual English and metric rulers guarantee precision alignment. Patented automatic blade latch activation with each cut, finger guard protecting full length of blade, and a torsion spring to prevent unintentional blade release. Plus, an ergonomic soft-grip handle and non-skid feet for extra security. Backed by manufacturer's lifetime limited warranty on blades and one year on all other components.