The ToughBuilt® insulation knife + sheath is designed for optimal edge retention and durability. The titanium-coated stainless steel blade is engineered to stay sharper up-to 2X longer when cutting mechanical and HVAC insulation. A full metal tang provides durability for tough cuts day after day. The durable molded sheath provides easy carry and storage. This hard-working knife keeps up with the rigorous demands of the pro and is backed by our full lifetime Warranty.