Victory Knives Diving Knife Set: Titanium-Coated Blunt-Tip Blade, Black, plus Harness Sheath Diving knife made from hardened German steel and finished with a proprietary metal-ceramic coating making the edge 5x harder than standard hardened blade steel 6 1/4 inch knife blade with a blunt tip for safety and a harness sheath lanyard and carabiner for a more application focused user Atomically bonded hybrid TiCN metalceramic compound for superior corrosion resistance, sharpness and edge holding Proven by commercial divers in the harshest deep-sea marine construction environments - riggers, commercial divers, underwater safety, sub-sea, north sea and platform All Victory Knives have a lifetime guarantee when under normal use and are made in New Zealand. For over 50 years our serrated underwater range has existed The modified near-surface structure is 5x harder than the standard hardened blade steel, with significantly improved corrosion performance The ceramic coating is about one to two microns thick and offers particular benefits in edge holding of the serrated blade teeth The coating is atomically bonded to the blade material and will not chip, crack, deteriorate or discolor in contact with sea water The process used to apply the coating is called Physical Vapor Deposition (&#034;PVD&#034;) and it is performed in a vacuum chamber at elevated temperature The metal used (titanium) is elevated by an electric arc and mixes with the ionized gasses (Nitrogen and Acetylene) in a plasma to form the ceramic on the blade surface literally one atomic layer at a time