Knife, Serrated Stainless Steel Bladed Duct Knife for Flexible Duct and Duct Board in Sheath Klein Tools DK06 Cuts duct board and flexible duct Double-edged knife-regular and serrated Puncture resistant nylon sheath with belt loop Cushion-Grip handle for comfort Klein Tools doesn't just make great products, we make great products that stand up to the demands of the professionals who use them every day ... Since 1857