Martin Yale W15 Premier Heavy-Duty Green Board Wood Trimmer, Cut Up To 20 Sheets at One Time, Steel Blades, 15 Inches 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 The original and still a favorite!. Fully-hardened self-sharpening high-carbon steel blade ensures a precise cut and long-lasting edge. Cuts mat board, cardboard, film, tissue and textiles. Safety features include a patented automatic blade latch that locks with every cutting motion and a finger guard that protects