Premier PRET12 SharpCut Trimmer, Cuts up to 15 Sheets at Once, 12" Cutting Length, Base Size 13.25" x 23" x 2.38 Medium-duty 1/2 Inches thick wood base Self-sharpening stainless teel blades cut up to 15 sheets at once Permanent 1/2 Inches grid and dual English and metric rulers Patented automatic blade latch locks with every cutting motion Finger guard protects entire length of blade