Martin Yale T12 Premier SharpCut Trimmer, 12" Cutting Length, Base Size 13.25" x 23" x 2.38", Self-sharpening Stainless Steel Blades Cut Up To 15 Sheets at Once Heavy-duty 1/2" thick wood base Hardened self-sharpening steel blade cuts up to 15 sheets of 20lb. bond paper at once Permanent 1/2" grid and dual English and Metric rulers ensure proper alignment Patented automatic blade latch locks with every cutting motion Finger guard protects entire blade length