The Milwaukee 6 in. Smooth Blade Insulation Knife is designed for optimal edge retention and durability. Milwaukee engineered the heat treated stainless steel blade to stay sharper up to 2X longer when cutting mechanical and HVAC insulation. The insulation blade is cryogenically hardened for the best jobsite performance. The Milwaukee insulation knife has a full metal tang that provides durability for tough cuts and a rounded handle allows for smoothing tapes and adhesive laps. Milwaukee insulation knife includes a durable blade cover for storage.