Martin Yale T15 Premier SharpCut 15" Cutting Length Paper Trimmer, Hardened Self-sharpening Stainless Steel Blades Cut Up To 15 Sheets of 20lb. Bond Paper At Once 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