No 8R Utility Knife Knife Blade. For general-purpose cutting. Paper, cardboard, plastic, twine, foam board, cartons, and coupons. When one end of blade dulls, blade can be reversed and other end used. Replacement blade for X-ACTO 8R Handle and X-Acto X7747 Board Cutter. Note: X-ACTO 8R blades have a larger hole than the Excel 8R Blades.