Martin Yale P212X Premier PolyBoard Paper Trimmer, Up To 10 Sheets of 20 Pound Bond Paper at Once, Permanent 1/2" Grid and Dual English and Metric Rulers Self-sharpening stainless steel blades cut up to 10 sheets at once Permanent 1/4 Inches grid and dual English and metric rulers Patented automatic blade latch locks with every cutting motion Finger guard protects entire length of blade Torsion spring prevents blade from accidentally falling during operation