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 Curved and straight blades are

Curved and straight blades are available for any application

and cast iron

In internal testing

Ends of the sandpaper do not tear or fray easily

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 Curved and straight blades areKey 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