Stanley Heavy-Duty Utility Knife Blade features pointed razor-type reversible blades designed for utility knives. These heavy-duty blades are made from durable carbon steel and are compatible with Model No. 99, 199, 299, and 1299 knives, as well as most other utility knives. The blades come in various package quantities, including 5, 50, and 100 pieces, with options for sturdy plastic dispensers that safety and convenience. They also include hang holes for easy wall mounting. Each blade measures 2-7/16 inches in length and has two holding notches for secure mounting, making them a reliable choice for heavy-duty cutting tasks. Model Number: 11-921A