Camillius, Heater, Folding Knife, Plain Edge, Skeletonized Handle, Matte Finish, Black, 1.75" Blade Length, 4.5" Overall Length, 440 Stainless Blade Steel, Included Sheath NEW WARNING Warning WARNING WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov. Blade Treatment: Carbonitride Titanium Blade Color: Black Blade Edge: Smooth Blade Grind: Hollow Product Description The Camillus HEATER Boot/Neck Knife is 4.5" overall in length, achieving discretion without compromising physical fortitude. It features a 1.75" 440 Stainless Steel blade, striking a balance between hardness and corrosion resistance. On top of the base 440 material, the steel is bonded with Carbonitride Titanium.