Check the listing for details. Klein Tools Serrated Duct Knife With Sheath. Condition: New. Listed at 18.00 USD. The Klein Tools Serrated Duct Knife (Model DK06) is a high-quality hand tool designed for cutting through ducts with ease. The stainless steel blade, with a width of 0.1 inches, offers durability and precise cutting. The comfort grip handle ensures a secure and comfortable grip while working. This set includes 2 pieces, the duct knife with sheath, making it convenient to carry and use whenever needed. Perfect for professionals and DIY enthusiasts alike, this duct knife is a versatile and essential tool for any workshop or job site.