Estwing 42454 5.5-inch Fixed Blade Double-Edged Duct Knife, Serrated Edge, Steel Pommel Cap, Cuts and Forms Mineral Wool Insulation, Duct Board, and Flexible Ducting Cordless Kits and HVAC tools all with

and HVAC tools all with famous Crescent Wiss quality built-in

In internal testing

and cast iron

anti-kickback design to control the depth of cut

Estwing 42454 5.5-inch Fixed Blade Double-Edged Duct Knife, Serrated Edge, Steel Pommel Cap, Cuts and Forms Mineral Wool Insulation, Duct Board, and Flexible Ducting Cordless Kits and HVAC tools all withKey Features: Designed to cut and form mineral wool insulation, duct board, and flexible ducting 5. 5 inch double edged slicing and serrated steel blade Full length tang with steel pommel cap for striking into stiff duct board Ergonomic handle with textured thermoplastic rubber overlay for a secure grip Hard nylon sheath with built in belt clip for convenient carrying and storage