MIDWEST® Flex Duct Knives – Rubberized Taper Handles are designed for cutting flexible duct and duct board and have a rubberized tapered finger grip handle for comfortable slip resistant use. The knife has a full tang and solid stainless steel rivets for long-lasting durability. The 5″ (12.7 cm) stainless steel, resharpenable double blade has both standard and serrated edges, which allows for cutting in both directions. The knife includes a ripstop nylon sheath for safe storage.