Martin Yale W12 Premier Heavy-duty Green Board Wood Trimmer, Cut Up To 20 Sheets at One Time, Steel Blades, 12 Inches, Green Heavy-duty 3/4 Inches thick wood base Through-hardened steel blades cuts up to 20 sheets at once Accurately cuts paper, matte board, cardboard, film, tissue, and textiles Permanent 1/2 Inches grid and dual English and metric rulers Patented automatic blade latch locks with every cutting motion