Hyde Tools 60118 8-3/4-Inch 14-Gauge Square-Point Insulation Knife, Black and Silver 1-Inch wide, 14-gauge chrome vanadium steel blade Wave blade design cuts foam core and most other insulation materials without binding Ergonomically engineered soft-grip handle Guaranteed forever Blade measures 8-3/4-Inch x 1-Inch x 0.083-Inch