Pointed razor-type reversible blades for utility knives. Regular blades are interchangeable for use with model No. 99, 199, 299, and 1299 knives and most other utility knives. Heavy-duty blades are interchangeable with model No. 99, 199, 299, and 1299 and other utility knives. Model No. 11-911A and 11-921A (SKU 335998) include sturdy plastic dispenser for safety and convenience. Has hang holes for wall mounting.