Milwaukee Tool insulation and duct knives, 2015-08-25, Plumbing and Mechanical

Milwaukee Tool’s Smooth Blade Insulation Knife, Serrated Blade Insulation Knife, and Duct Knife stay sharp up to five times longer. The insulation knives feature a full tang and a rounded handle. For added utility, the tools have a lanyard hole for tethering and storage, and also come equipped with a durable blade cover. The duct knife is optimized for cutting duct board, insulation and flex duct. It features a double-edge blade, a full tang and a durable sheath. Milwaukee Tool. 

Milwaukee 3 in. Hardline D2 Steel Smooth Blade Pocket Folding Knife 48-22-1994 - The Home Depot

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The MILWAUKEE® Duct Knife is designed for optimal edge retention and durability. The stainless steel blade is engineered to stay sharper up to 5X

Milwaukee Duct Knife

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 48-22-1921 Smooth Blade Insulation Knife

Duct Knife (48-22-1920)

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Milwaukee Insulation Knife & Duct Knife Review