The ToughBuilt Insulation Knife + Sheath (TB-H4S-40-IK-2) 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.