Heavy-Duty Utility Blades are designed for heavy-duty, all-purpose cutting and scoring. Design features a thick base and razor-sharp edges, making it an ideal blade for construction work, home remodeling and other tough tasks. Each blade is oxidized to preserve the blade's edge and prevents rusting. Durable blade works on matboards, carpeting, wallboard, wallpaper, tile, plastic and wood. Blade fits Elmer's X-Acto Utility Knife, Ergo Utility Knife and Surgrip Retractable Utility Knife..